How to use law of cosines to find the missing angles of a triangle given SSS

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  • Опубликовано: 20 окт 2024

Комментарии • 560

  • @matwithahat1200
    @matwithahat1200 6 лет назад +585

    My teacher didn't feel the need to explain this and just gave us an example to copy down. Glad I found this. Thanks

    • @brianmclogan
      @brianmclogan  6 лет назад +114

      sorry to hear about that, but happy this video was able to help

    • @kirov9605
      @kirov9605 6 лет назад +5

      same

    • @Dthunder00
      @Dthunder00 5 лет назад +3

      Same

    • @chaos6031
      @chaos6031 5 лет назад +6

      Either I was gone, or my teacher didn't explain it very well at all. Of course I find this AFTER the quiz with this form of question. Also glad it found this. :)

    • @saludlemus4506
      @saludlemus4506 5 лет назад +2

      same

  • @vuto8089
    @vuto8089 4 года назад +678

    Ad before this video: Are the RUclips math videos from 7 years ago really helping?
    Me: yes, yes they are

    • @kentuckysmoose
      @kentuckysmoose 4 года назад +15

      Study pug did seem appling but free youtube is way cheaper

    • @jonahwizard1
      @jonahwizard1 3 года назад +7

      The laws of math have changed every day since RUclips was invented. Thankfully, Study Pug keeps up with the times.

    • @Des-po9rd
      @Des-po9rd 3 года назад +18

      Right. I'm still getting assignments from 7 years ago lol

    • @emaanbatth8228
      @emaanbatth8228 3 года назад

      @@kentuckysmoose i know right

    • @fivi_lopa
      @fivi_lopa 2 года назад

      9 yrs ago now

  • @pandabeans8463
    @pandabeans8463 6 лет назад +299

    Apparently in college no explanations are needed....Wouldn't survive without your videos dude. Thank you.

    • @kirov9605
      @kirov9605 6 лет назад +11

      yea lot of dumpster tier professors

    • @kytaylor3010
      @kytaylor3010 5 лет назад +1

      omgg savee me i need help lol

    • @pandabeans8463
      @pandabeans8463 5 лет назад +2

      @@kytaylor3010 If you need help you can add my on Facebook I'd be happy to help. Taking Calc 1 now.

    • @kytaylor3010
      @kytaylor3010 5 лет назад

      Tati Beans ok what’s your messenger I’ll send you a request bc i don’t have Facebook just messenger

    • @pandabeans8463
      @pandabeans8463 5 лет назад

      @@kytaylor3010 Tatiana Brito. It's the picture with me and my husband.

  • @Johng4123_
    @Johng4123_ 5 лет назад +1188

    Who here is brushing up just before a big test like i am

    • @asnee100
      @asnee100 4 года назад +21

      I have an exam tmrw 🤦🏾‍♂️🤦🏾‍♂️🤦🏾‍♂️🤦🏾‍♂️

    • @dkiv478
      @dkiv478 4 года назад +30

      @@asnee100 im doimg my exam online at the moment 😂

    • @jerrymouse5282
      @jerrymouse5282 4 года назад +4

      John Green no Im actually responsible unlike you imbeciles

    • @keiranmordue9104
      @keiranmordue9104 4 года назад +6

      lol my finals in 12 hours

    • @nethertorch4200
      @nethertorch4200 4 года назад +2

      Me

  • @brianmclogan
    @brianmclogan  11 лет назад +24

    you are very welcome. happy to help. Let me know if you need any other help!

  • @pandabeans8463
    @pandabeans8463 6 лет назад +98

    Got a 90% on my exam THANK YOU !!!

  • @miasen
    @miasen 6 лет назад +64

    bless your soul, my math teacher doesn't teach unless we ask, and i've always had trouble with trigonometry. Thanks!

    • @brianmclogan
      @brianmclogan  6 лет назад +3

      you are very welcome!

    • @OrbitalMinds
      @OrbitalMinds 3 года назад

      best teacher on yt ^^

    • @kayakerdude3727
      @kayakerdude3727 Месяц назад

      I agree - He's awesome. I don't know why so many math teachers don't explain or teach it well or offer help outside class. My goal is to be a math teacher and I would want my students to understand and succeed. So many it seems use their math class to basically show off being good at something difficult when a good teacher takes something difficult and attempts to make it understandable. When I was in school the students who didn't understand fell behind quickly because of this and were turned off math and claimed they were 'stupid' in math - There's no such thing as that..... It's like learning the guitar and takes a good teacher/mentor and practice, practice, practice. They were just discouraged and gave up.

  • @marisacharlotte7242
    @marisacharlotte7242 6 лет назад +11

    Helping me get 100% on every weekly quiz since the start of the semester. You explain it so much better than any of my lecturers.

  • @brianmclogan
    @brianmclogan  11 лет назад +43

    sweet happy to help,let me know what else I can do to help

    • @youngdolphilms3274
      @youngdolphilms3274 6 лет назад +3

      Brian McLogan thanks

    • @DML-wt1ke
      @DML-wt1ke 5 лет назад +2

      Brian McLogan there is a direct answer for this using SciCal or a shortcut but i forgot what was it. its kinda divided by to i forgot can u teach me? 😭😭

  • @benweigel7918
    @benweigel7918 7 лет назад +305

    My exam is in an hour thank you

  • @rheajeancuizon8384
    @rheajeancuizon8384 5 лет назад +34

    I'm a junior high school student and I missed this topic because I was sick that day:< this topic was given on tuesday (march12) and wt*😩 tomorrow is our final exam but i still can't understand this topic because no one would gonna help me (myLUnGsisdYinG). I'm so thankful because you're here to teach us on how to get the law of cosines!!🤗💕

  • @doga2404
    @doga2404 2 года назад +2

    I am currently a college student who is taking math90(İntro to College Mathematics) which is mandatory in my program. Thanks to you I've learned math in one college semester with zero math background.I want to say thank you, wish I had a math teacher like you! For the students who do not appreciate your effort, ı want to say they do not know how fortunate they are .
    Thank you !

  • @backupookjj5611
    @backupookjj5611 3 года назад +8

    Best teacher ever. I have pre calculus and u helped me so much

  • @mohamadchahine3623
    @mohamadchahine3623 5 лет назад +8

    Thank you very much for this lesson, understandable explanation and you know what you’re talking about. Learned more in 4 minutes than 50 minutes in my precalc class thanks so much

  • @gabby_5820
    @gabby_5820 3 года назад +34

    Why do I feel like youtube is helping me more with my assignments

  • @thetrukidshadow1941
    @thetrukidshadow1941 3 года назад +7

    I owe this man my whole semester, I learn more from him then from my actual teacher

  • @jetmemes3265
    @jetmemes3265 6 лет назад +2

    this is explained 100x better than my professor, like he just works the problem and trys to explain after, where you explain what your doing. thank you so much!

  • @djskellexx8755
    @djskellexx8755 4 года назад +83

    Who here is teaching themselves because the school closed due to Coronavirus? and my homework’s are all piled up 😭😭😭

  • @keiaramilan
    @keiaramilan 4 года назад +25

    when you said "keiara" i was looking like "dang what i do" lol

  • @TheImpossibleCube
    @TheImpossibleCube 6 месяцев назад

    I'm 6th grade and I'm already learning this. I just felt like this is the only right video I can find since the other videos from other youtube channels I don't understand. It's really helping me on Geometry. You're providing me and all young people like me a really bright future. Thannnks! ⭐

  • @pammyhill3934
    @pammyhill3934 8 лет назад +14

    thank u very much. i understand clearly now, my professor did not explain the division part. God bless you man !!!!!!

    • @brianmclogan
      @brianmclogan  8 лет назад +4

      happy to be able to help you out

  • @nickdantzlerward8567
    @nickdantzlerward8567 7 лет назад +11

    Incredible! You make learning this stuff so easy. Thank you from the bottom of my heart!

  • @Tanner_777
    @Tanner_777 7 месяцев назад +1

    I really appreciate it, helped with my homework.

  • @Prazzic
    @Prazzic 4 года назад +1

    i wouldn't pass precal trig without this man. god bless

    • @izamils
      @izamils 2 года назад

      Same. :)

  • @ilovepalmtrees08
    @ilovepalmtrees08 11 лет назад +6

    Thank you so much! I kept on getting domain error because I was doing one of the steps wrong, but your video helped me realize that! Thank you so much!!! :)

  • @Gardiencotier13
    @Gardiencotier13 5 месяцев назад

    Your best video of trig laws by far!!! Thank you. You are like a language teacher who can demystify math. You rival sal from khan academy. You both very good but I think you win.

  • @HJ-lk9hx
    @HJ-lk9hx 3 года назад

    My teacher wasn’t teaching this properly, so I left the video call (I’ll be getting in trouble for that) now i’m given a test paper on sine and cosine rules. Thanks to this guy I’m clear on sine and cosine rules. Now we’ll see if my teacher gives me bad grading.

  • @gaongalelwemmusinyane7240
    @gaongalelwemmusinyane7240 28 дней назад +1

    Oooohhhh, man thank you I just solved the problem that have been stressing me❤❤🎉🎉

  • @Sissy0119
    @Sissy0119 7 месяцев назад +1

    when yo teacher dont explain nun and this man out here doin it all 🙏🙏🙏 when i pass geo im givin this man credit

  • @UgrevsBoots
    @UgrevsBoots 6 месяцев назад

    Wish I could bring you back to my high school days. This was a great tut. I'm doing CAD and needed an angle on something. No protractor, but I wrote these steps out in C# and now I can just plug numbers in. Thanks! This was fun!

  • @MiaStaAna-ey2be
    @MiaStaAna-ey2be 4 года назад +1

    I haven't realised, but I keep coming to your channel and everything is just fitting to all of my problems and man I wish you were my teacher 😭😭✋

  • @kayakerdude3727
    @kayakerdude3727 Месяц назад

    This is the beauty of the Internet despite some problems it creates... in the past if you wanted to know how to do something be it fixing your brakes, carpentry topics... literally anything... you had only two places to go a) a book or b) hope you have friend/family who both know how to do something but also are not jerks and willing to share and teach you how. In my days as a math student, the text books were not the best at explaining WHY they did something - They just did it or skipped a step you still need to know and as a result you were lost to how they got to their answer - On top of that I had smug teachers and classmates who understood it who instead of showing somebody like me how it's done they left ones like me in the dark while they bragged, felt cocky, and basically had a big pissing contest over their expertise in math and enjoyed the fact they were good at something others weren't - Screw them. Thank God for guys like this teacher and the Internet because some of the best examples and teachers/professionals of many disciplines are willing to share their gift and help

  • @ilikekoolaid-1341
    @ilikekoolaid-1341 Год назад +1

    Do i need to use sine law to get the other two angles or can i keep using cosine law to find them

  • @ryanhachey
    @ryanhachey 2 месяца назад

    You definitely are helping me improve my math as I’m upgrading online thank you so much

  • @lindseyf2410
    @lindseyf2410 3 года назад

    Omg thank you random math teacher on RUclips you helped me figure out a math problem I have been tryna do for so longggg

  • @Dougson
    @Dougson 3 года назад

    I legit took notes on how to do this when my teacher "taught" us. You are a lifesaver before my test.

    • @_xyfaith
      @_xyfaith 3 года назад

      I cannot still understand the part of 3:25 to 3:42. Can you explain it?

    • @Dougson
      @Dougson 3 года назад

      @@_xyfaith You cannot get rid of -140 from both sides because -140 is multiplying with cosC.

  • @rheadagohoyst
    @rheadagohoyst 3 года назад

    Thank you so much for your videos sir. It helps a lot during my review. I am now an engineer here in the Philippines. God bless you more sir 😇😇😇😇

  • @ahira302
    @ahira302 4 года назад

    Sir thank you very much the way you taught me. I m not a student at the age of 41yrs but I m learning all these for my son .
    Dhanyavad Guru ji

  • @alyssaheyer
    @alyssaheyer 2 года назад

    You helped me pass my scenic construction final. Thank you so much!

  • @florencerobi4470
    @florencerobi4470 7 месяцев назад

    Am thankful for this channel,thanks God bless you 😊❤

  • @alondradelamora0917
    @alondradelamora0917 4 года назад +15

    Idk why my teacher is making me do this “so called review homework” when I’m a sophomore in math 2?!
    I never even learned law of sines!!! Idk what a cos,tan, or sin is! Ugh 😫
    Btw the corona virus closed down all schools so I really have no one to help me out on this:(

    • @alondradelamora0917
      @alondradelamora0917 4 года назад +2

      T.A. Peace nah I’m good but thanks. I understood the work it’s just that online school is giving me way to much homework then what we usually get

    • @GeorgeDCowley
      @GeorgeDCowley 4 года назад

      Well, you do now.

  • @sevenunderwater8099
    @sevenunderwater8099 3 года назад

    just letting you know you kinda saved my life man thanks

  • @von2782
    @von2782 6 лет назад +5

    Thank you I have an exam tomorrow and I didn’t get this at all. I wish you were my teacher thank you

    • @brianmclogan
      @brianmclogan  6 лет назад +1

      happy to be able to help you out! best of luck!

  • @drewmaraj9767
    @drewmaraj9767 4 года назад

    you are my savior you've helped me out so many times

  • @josephgwapo7917
    @josephgwapo7917 Год назад +2

    Thank you sir! I have exam today and I really understand the concept of the lesson. Wish me luck for later🖤🌌

  • @alyssaadair6703
    @alyssaadair6703 4 года назад

    you are a blessing on this earth thank you so much for your videos, they save my geometry grade

  • @themexicanjesus3079
    @themexicanjesus3079 4 года назад +1

    Thanks your❤️ your videos helped a lot. Keep up the good work 👍

  • @raviarora4749
    @raviarora4749 5 лет назад +4

    Hi sir! Thank you for such wonderful videos!
    I have found a much shorter way to find the angles if you know the sides!
    Is there any platform I could discuss it with you on?
    Please reply
    Thank you

    • @izamils
      @izamils 2 года назад +2

      What is the way?!

  • @JayMan_
    @JayMan_ 3 года назад

    This teacher is a life saver wish I had him as my teacher instead

  • @plaintuber4549
    @plaintuber4549 2 года назад

    this video explains it best I'm here 9 years later and just learnt this thru the vid

  • @saludlemus4506
    @saludlemus4506 5 лет назад +1

    Thank u i have a test and the teacher did not teach us anything about these u saved my live.😄

  • @savanna5107
    @savanna5107 3 года назад +5

    my teacher is incompetent 😁😁😁. thank you

  • @maybejazmine
    @maybejazmine 2 года назад

    THANK YOU SO MUCH!!! You're a lifesaver, sir!

  • @cjcaputo2959
    @cjcaputo2959 5 лет назад +1

    all these videos are great thank you so much

  • @richardcarlin1332
    @richardcarlin1332 4 года назад

    He is a good teacher.

  • @tasafbari6951
    @tasafbari6951 7 лет назад +1

    I got full marks on my culminating project only because of you sir! Thank you so much

    • @brianmclogan
      @brianmclogan  7 лет назад +2

      happy to be there for you. Keep up the hard work

  • @mominurislam3912
    @mominurislam3912 4 года назад

    Quite interesting!
    Your presentation is awesome.
    🇧🇩🇧🇩🇧🇩love you from Bangladesh

  • @outsk8u4good
    @outsk8u4good 4 года назад +4

    Man, you subtracted that 149 from 225 lightning quick (3:47)

  • @davidm3210
    @davidm3210 5 лет назад

    Excellent presentation - clear & pleasant without too much shtick.

  • @louissummers8747
    @louissummers8747 4 года назад

    Always come back here if I need help. Great explaination man.

  • @silvaroo
    @silvaroo Год назад +1

    Thank you very much for your help!!

  • @khristyan2377
    @khristyan2377 4 года назад

    Our project is a real life situation. Thank you so much for making this video it really help me.

  • @johnnyyoungkootong262
    @johnnyyoungkootong262 2 месяца назад

    Thankyou for helping me with my homework❤❤❤❤

  • @PE10041
    @PE10041 7 лет назад +37

    thanks mr free math :-)

  • @TurtlGal1
    @TurtlGal1 2 года назад

    Thanks so much man, my teacher didn't explain this and just put it on our final, so i needed to get an explanation on how it works, thanks!

  • @fregilonmae1586
    @fregilonmae1586 5 лет назад +1

    thank u so much u helped me learn alot since i am taking my final exam later and i wish u were my math teacher :(

  • @edwinmedrano3553
    @edwinmedrano3553 3 года назад

    thank you for your videos they helped me finish a semester worth of work in only 14 hours(my bakc is killing me lol)

  • @desmondfromlost
    @desmondfromlost Год назад

    I'm surprised I've made it to college without learning how to do this. Thanks!

  • @erikgonzalez216
    @erikgonzalez216 3 года назад +1

    You’re teaching is so on point, thank you so much!

  • @brianmclogan
    @brianmclogan  11 лет назад +8

    hahaha happy you found out why you had a different value. Happy to help!

  • @rommelnatnat4772
    @rommelnatnat4772 7 лет назад +1

    Thank you for this free tutorial.

  • @da9558
    @da9558 4 года назад

    God bless you !! this vid is about to help a ton

  • @jeffburnette5830
    @jeffburnette5830 3 года назад

    Very helpful, Teach! You make it look so easy!

  • @julianaortiz7281
    @julianaortiz7281 5 лет назад +1

    Legit learn more from you then my own teacher

  • @Trapezoideris
    @Trapezoideris 5 лет назад

    this channel is a godsend

  • @i_like_bread8835
    @i_like_bread8835 Год назад

    Thank you! I have an exam tomorrow and this really helped me.

  • @anthonylebario4460
    @anthonylebario4460 6 лет назад +1

    Hi Brian, do you have full lecture videos of your trigonometry/pre-calculus class on youtube or a website of yours? Thank you.

    • @brianmclogan
      @brianmclogan  6 лет назад

      I do not have full lecture but I do have longer video forms in trigonometry here ruclips.net/p/PL0G-Nd0V5ZMrrerrVzaAc-laHntIAIsf_ and ruclips.net/p/PL0G-Nd0V5ZMqzhgNhVka6bNLYOYFzL_D3

  • @renan6827
    @renan6827 5 лет назад

    Thank you!! Great explanation. Your video has really saved !!

  • @jatinmishra5542
    @jatinmishra5542 3 года назад

    One of the dream of my life is to get a like from this guy😶😶😶😶😶
    He helped to improve my concept

  • @VortexSwayzee
    @VortexSwayzee 2 года назад +2

    My Left AirPod: 🔈
    My Right AirPod: 🔇

  • @MtsTrading
    @MtsTrading 3 года назад

    love you you just saved me exercice of 6 points love youuuuuuuuuuuuuuuuuuuuuuuu

  • @dayDream-o8i
    @dayDream-o8i 9 месяцев назад

    Man tysm you explain. Better than my maths teacher. 😅

  • @baievertebagscompany
    @baievertebagscompany 7 месяцев назад

    time: 5:33 - I get 76/-144= -.5429 but after that, no matter what i pump in I can not come up with an angle of 122.88 degrees. I used SIN COS TAN ASIN ACOS ATAN, with radiant and without, nothing close to your answer. You magically pumped this number into your calculator and got this answer. So this is where the whole thing fell apart for me.

  • @Gelatovaniglia
    @Gelatovaniglia 2 года назад

    Thank u so much like you really explained that well.

  • @BBGshop7
    @BBGshop7 4 года назад +1

    Omg.. you have explained this so well.. it's so simple to solve.. and you helped me understand what the inverse thing is all about -I like the tip you used about finding the largest angle first.. it is the simplest and most accurate way to find all angles. I enjoy your teaching style. :)

  • @-alyssa-7216
    @-alyssa-7216 4 года назад

    i wish you were my teacher 😓 you help out so much !

  • @nandaniheerah5569
    @nandaniheerah5569 4 года назад

    Helped me to do my homework. . Thank you ❤

  • @theslowcuber
    @theslowcuber 3 года назад +1

    What do i do if the angles and sides arent labeled with variables???

  • @Yourbaesumii
    @Yourbaesumii 6 месяцев назад +1

    What if one of the sides is a decimal? I'm so confused bcs no matter how much I keep solving my answers come out different everytime 😭😭😭

  • @murrdippolito3544
    @murrdippolito3544 3 года назад

    Literally 8 years later you became the whole nation's math teacher

  • @ronaldyang5617
    @ronaldyang5617 6 лет назад +1

    Thanks bro. This helped me on my homework!!!

  • @saragonzales1932
    @saragonzales1932 4 года назад

    thank you so much for this video, you just helped me understand how to do all of my homework now🥺

  • @miaclancy9390
    @miaclancy9390 3 года назад

    Literally just got done bawling my eyes out because I got a 57 on my first test of the year and now I’m here…. #IBstudent

  • @marcosda4th92
    @marcosda4th92 4 года назад

    I just started statics (not statistics) in college, and needed a refresher. After an hour of frustration, I realized the 2ab part of the equation was not a common variable with the first a^2+b^2. Dang order of operations threw me off for a bit ,which I never thought would happen after highschool 😅
    Anyways, great explanation! This helped a lot :)

  • @kellisiders5875
    @kellisiders5875 2 года назад

    For the problem I'm doing, I got 2.14=cosB, but you can't do cos^-1(2.14) because it says error. What do I need to do to resolve this problem? I followed all of the steps you did. What am I doing wrong?

  • @andreabriseno9529
    @andreabriseno9529 3 года назад

    He explains it so well

  • @randoron8644
    @randoron8644 3 года назад

    this guy makes everything make sense

  • @tapallaabegailf.4232
    @tapallaabegailf.4232 4 года назад

    Thank you sir...❤ And Godbless

  • @Kai-rf7rg
    @Kai-rf7rg 10 месяцев назад

    thank u sir u saved my precalc grade

  • @luisramos2521
    @luisramos2521 4 года назад

    Great explanation!!! Good job.