Sum of the angles of a triangle is 180° (Theorem)

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  • Опубликовано: 8 авг 2024
  • Visit us at - www.risingpearl.com
    Like us at - risingpearlfans
    Friends,
    This is a Math video. This is our tenth webisode (WB-10) on "Series 6 -- Lines and Angles".
    In this video, we learn that sum of all angles in a triangle is 180°. We know that a triangle has three sides and three vertices. We also know that there are three interior angles in a triangle.
    Here, in this presentation, we see that no matter how we draw our triangle, sum of all the three angles in a triangle will always be 180°. We prove this theorem.
    This video is suited for class-9 (Class-IX) or grade-9 kids.
    Cheers,
    Friends at Rising Pearl

Комментарии • 122

  • @shahnazparveen3503
    @shahnazparveen3503 4 года назад +10

    prepare it
    this was come in my half yearly exam

    • @dostotussigreatho
      @dostotussigreatho  4 года назад

      Hi Shahnaz, Hope the video helped out and you did well in your exam. Cheers,

    • @shahnazparveen3503
      @shahnazparveen3503 4 года назад

      yes sir it help me a lot and I get good marks.
      thanku .....👏👏

    • @dostotussigreatho
      @dostotussigreatho  4 года назад

      @@shahnazparveen3503 I am very happy for you. Congratulations! I am in the process of making new playlists and videos. Pls do check them out as you may find them helpful too. Oh, and pls do share your feedback when you get a chance on new videos and playlists. Cheers,

    • @dostotussigreatho
      @dostotussigreatho  4 года назад

      Hi Shahnaz,
      Pls check out new playlists that contain all videos for Class-9 Math for Numbers, Polynomials, Coordinate Geometry, Linear equations, Intro Euclid's geometry, Lines and Angles, Traingles, Quadrilaterals, Areas of Parallelograms and more. Hope you like the videos. When you get a chance, pls do share your feedback. It would be great to hear from you. Thanks! Cheers,

    • @dostotussigreatho
      @dostotussigreatho  3 года назад

      Hi Shahnaz,
      I wanted to share that last month, I have launched a new website called dailymathpro.com/.
      I post one new Math question everyday. Anyone can answer the question in the comments section. Everyone is encouraged to do so. It is free to use and no registration is required.
      The very next day, I post the answer to the previous day's question and the new question for that day.
      This will greatly benefit anyone who is interested in Math and is preparing for competitive exams. The questions are designed to make student think outside the box.
      Pls do check it out as you may find them helpful.
      Cheers,

  • @pinkikanwar9147
    @pinkikanwar9147 6 лет назад +4

    Thanks for Helping me

  • @khushigoyal7467
    @khushigoyal7467 6 лет назад +4

    Wow it's such a helpful video for me

    • @dostotussigreatho
      @dostotussigreatho  6 лет назад

      Khushi - You are very welcome. Glad you liked the video. Pls check out some of the other videos and share your feedback on those as well. Cheers,

  • @tejaspatil9034
    @tejaspatil9034 3 года назад

    Very thankful to you sir because I have understood very nicely and clearly.

  • @mirzarahematullabaig2782
    @mirzarahematullabaig2782 7 лет назад +9

    Sir this video is very helpful. Thank you sir.

  • @riddhigupta3819
    @riddhigupta3819 4 года назад +1

    Your explanation is stunning

    • @dostotussigreatho
      @dostotussigreatho  4 года назад

      Hi Vishisth,
      You are too kind! Thank you for such a wonderful comment. I very much appreciate it.
      Cheers,

    • @dostotussigreatho
      @dostotussigreatho  3 года назад

      Hi Riddhi,
      I wanted to share that last month, I have launched a new website called dailymathpro.com/.
      I post one new Math question everyday. Anyone can answer the question in the comments section. Everyone is encouraged to do so. It is free to use and no registration is required.
      The very next day, I post the answer to the previous day's question and the new question for that day.
      This will greatly benefit anyone who is interested in Math and is preparing for competitive exams. The questions are designed to make student think outside the box.
      Pls do check it out as you may find them helpful.
      Cheers,

  • @thakurgautam1268
    @thakurgautam1268 5 лет назад +1

    So very very thanks for learn this theorum

    • @dostotussigreatho
      @dostotussigreatho  5 лет назад

      Hi Gautam,
      You are very welcome! Glad you liked the video and found it helpful. Please like the video. Please check out other videos on my channel at
      ruclips.net/channel/UCJL7bOA96kKTl6Vkh_uWP4w
      Share you thoughts and feedback on other videos too as and when you get to watch them.
      Cheers,

  • @ritikaritul4798
    @ritikaritul4798 3 года назад +1

    Suppose that if we have to prove it for our project, then which one we'll write process 3 or 4

  • @Jashmita_Art
    @Jashmita_Art 5 лет назад +7

    Is it necessary that the theorem should be prove similar to textbook

    • @dostotussigreatho
      @dostotussigreatho  5 лет назад +3

      Hi Joyitka, What is important is that you learn and understand the theorem. There can be more than one way to prove a theorem. You can choose any of right ways you like. Cheers,

    • @dostotussigreatho
      @dostotussigreatho  4 года назад +1

      Hi Joyitka,
      Pls check out new playlists that contain all videos for Class-9 Math for Numbers, Polynomials, Coordinate Geometry, Linear equations, Intro Euclid's geometry, Lines and Angles, Traingles, Quadrilaterals, Areas of Parallelograms and more. Hope you like the videos. When you get a chance, pls do share your feedback. It would be great to hear from you. Thanks! Cheers,

  • @smritipaul3605
    @smritipaul3605 4 года назад

    Is this same method can be proved in Right angled and obtuse angled triangle

    • @dostotussigreatho
      @dostotussigreatho  3 года назад

      Hi Smriti,
      I wanted to share that last month, I have launched a new website called dailymathpro.com/.
      I post one new Math question everyday. Anyone can answer the question in the comments section. Everyone is encouraged to do so. It is free to use and no registration is required.
      The very next day, I post the answer to the previous day's question and the new question for that day.
      This will greatly benefit anyone who is interested in Math and is preparing for competitive exams. The questions are designed to make student think outside the box.
      Pls do check it out as you may find them helpful.
      Cheers,

  • @nithyasree8905
    @nithyasree8905 2 года назад

    I don't know Hindi but I can understand your speech and teachingthank you so much for your video it is very useful for me

  • @lwm-laughwithmemes2006
    @lwm-laughwithmemes2006 4 года назад +1

    Thank you

  • @Luckyrajput8044
    @Luckyrajput8044 Год назад

    Thank you so much sir you are the best

  • @ManojPatil-sy2vl
    @ManojPatil-sy2vl 6 лет назад +2

    Thanks sir for helping me

    • @dostotussigreatho
      @dostotussigreatho  6 лет назад

      Manoj - You are very welcome. Pls check out more videos at
      ruclips.net/user/dostotussigreatho
      Pls share your feedback on those videos too. Cheers,

  • @bablugupta78909
    @bablugupta78909 3 года назад +2

    Thanks sir😃

  • @prinicorn4208
    @prinicorn4208 5 лет назад

    Thanuhhh soo much sir very helpfull😘😘😘😘

  • @harmeetkaur7010
    @harmeetkaur7010 6 лет назад

    that's very nice

  • @rumidaspayeng3037
    @rumidaspayeng3037 3 года назад +1

    Thanks for this

  • @gursagarsahota3008
    @gursagarsahota3008 5 лет назад +1

    Helpful our students

  • @neerajkuhar8147
    @neerajkuhar8147 4 года назад

    Very good idea

    • @dostotussigreatho
      @dostotussigreatho  4 года назад

      Hi Neeraj, I am glad you found the video helpful. Cheers,

    • @dostotussigreatho
      @dostotussigreatho  4 года назад

      Hi Neeraj,
      Pls check out new playlists that contain all videos for Class-9 Math for Numbers, Polynomials, Coordinate Geometry, Linear equations, Intro Euclid's geometry, Lines and Angles, Traingles, Quadrilaterals, Areas of Parallelograms and more. Hope you like the videos. When you get a chance, pls do share your feedback. It would be great to hear from you. Thanks! Cheers,

  • @draxgaming3607
    @draxgaming3607 4 года назад +2

    Amazing concept sir
    Thnx

    • @dostotussigreatho
      @dostotussigreatho  4 года назад

      Hi Komal, You are very welcome! I am glad you liked the video. Thanks for sharing your comments. Pls do check out some of my other videos and let me know what you think. Thanks again! Cheers,

    • @dostotussigreatho
      @dostotussigreatho  4 года назад

      Hi Komal,
      Pls check out new playlists that contain ALL videos for Class-9 Math for Numbers, Polynomials, Coordinate Geometry, Linear equations, Intro Euclid's geometry, Lines and Angles, Traingles, Quadrilaterals, Areas of Parallelograms and more. Hope you like the videos. When you get a chance, pls do share your feedback. It would be great to hear from you. Thanks! Cheers,

    • @dostotussigreatho
      @dostotussigreatho  3 года назад

      Hi,
      I wanted to share that last month, I have launched a new website called dailymathpro.com/.
      I post one new Math question everyday. Anyone can answer the question in the comments section. Everyone is encouraged to do so. It is free to use and no registration is required.
      The very next day, I post the answer to the previous day's question and the new question for that day.
      This will greatly benefit anyone who is interested in Math and is preparing for competitive exams. The questions are designed to make student think outside the box.
      Pls do check it out as you may find them helpful.
      Cheers,

  • @kxkdjdkdkdjdkdkdkdkd4965
    @kxkdjdkdkdjdkdkdkdkd4965 7 лет назад +2

    can you explain the last part OR

    • @snigdhamohanta1391
      @snigdhamohanta1391 6 лет назад

      see the video once more stupid

    • @bhartishastri9955
      @bhartishastri9955 6 лет назад

      You are best you explain in simple maner that all of as was understand thanks 😊😊

  • @rishiverma7657
    @rishiverma7657 5 лет назад

    Very very helpfull video

    • @dostotussigreatho
      @dostotussigreatho  5 лет назад

      Hi Rishi, You are very welcome! Thanks for your comment. Cheers,

  • @kanapanwar4498
    @kanapanwar4498 6 лет назад +1

    luv u bhai

  • @viraj7107
    @viraj7107 4 года назад +1

    Very easyly you solved the theorem(sir)

    • @dostotussigreatho
      @dostotussigreatho  4 года назад

      Hi Aditya, I am glad you liked the video and found it helpful. Thank you for your feedback. I very much appreciate it. Cheers,

    • @dostotussigreatho
      @dostotussigreatho  3 года назад

      Hi Viraj,
      I wanted to share that last month, I have launched a new website called dailymathpro.com/.
      I post one new Math question everyday. Anyone can answer the question in the comments section. Everyone is encouraged to do so. It is free to use and no registration is required.
      The very next day, I post the answer to the previous day's question and the new question for that day.
      This will greatly benefit anyone who is interested in Math and is preparing for competitive exams. The questions are designed to make student think outside the box.
      Pls do check it out as you may find them helpful.
      Cheers,

  • @sahilchib5286
    @sahilchib5286 5 лет назад +1

    Thanks

  • @runamohan9366
    @runamohan9366 6 лет назад

    very very good

    • @dostotussigreatho
      @dostotussigreatho  6 лет назад

      Runa - Glad you liked the video! Thanks for your feedback. Pls check out some of the other videos on the channel and share your feedback. Cheers,

  • @maahilovesfood6647
    @maahilovesfood6647 4 года назад

    Nice explaination 😌👌

    • @dostotussigreatho
      @dostotussigreatho  4 года назад +1

      Hi Shinnkaur,
      I am glad you liked the video and found it helpful. Thanks for sharing your feedback.
      Cheers,

  • @harshrana8672
    @harshrana8672 5 лет назад

    Thnx

  • @ameeyasethi5385
    @ameeyasethi5385 5 лет назад

    It will helpfull to me

    • @dostotussigreatho
      @dostotussigreatho  5 лет назад

      Ameeya - Glad you liked the video and found it helpful. Please check ALL videos at ruclips.net/user/dostotussigreathovideos and kindly share your feedback as and when you get to watch them. Cheers,

  • @niharladla
    @niharladla 7 лет назад +2

    this video is very helpful.thanks and keep it up

  • @kamleshprasad9395
    @kamleshprasad9395 6 лет назад

    Thank u so much !!!!!!!

    • @dostotussigreatho
      @dostotussigreatho  6 лет назад

      Kamlesh - You are very welcome. Glad you liked the video and found it helpful. Cheers,

  • @sushmachauhan7619
    @sushmachauhan7619 6 лет назад +1

    tyy

  • @weyaxzs
    @weyaxzs 5 лет назад +1

    can you use the proof to a two column chart proof?

    • @dostotussigreatho
      @dostotussigreatho  5 лет назад

      Rea, Can you pls elaborate on your question? Cheers,

    • @jeromebustillo4067
      @jeromebustillo4067 5 лет назад

      In our subject, in proving theorems we use 2 column chart. The thing that contains in the left are the Statements and the right part is the reasons why you used that statement.

  • @sandishnanepta6147
    @sandishnanepta6147 5 лет назад +1

    Thanks very much this had came in my paper

    • @dostotussigreatho
      @dostotussigreatho  5 лет назад

      Hi Sandishna, You are very welcome! I am glad you found the video to be helpful and that you were able to answer this question correctly in the paper. Thank you for sharing your feedback. I very much appreciate it. Cheers,

    • @dostotussigreatho
      @dostotussigreatho  4 года назад

      Hi Sandishna,
      Pls check out new playlists that contain all videos for Class-9 Math for Numbers, Polynomials, Coordinate Geometry, Linear equations, Intro Euclid's geometry, Lines and Angles, Traingles, Quadrilaterals, Areas of Parallelograms and more. Hope you like the videos. When you get a chance, pls do share your feedback. It would be great to hear from you. Thanks! Cheers,

  • @kxkdjdkdkdjdkdkdkdkd4965
    @kxkdjdkdkdjdkdkdkdkd4965 7 лет назад +4

    how LBac came at second last statement

  • @sandeepshriwas1630
    @sandeepshriwas1630 7 лет назад +3

    thank you so much sir

  • @latashaha3079
    @latashaha3079 Год назад

    🎉🎉🎉

  • @preetimoolchandani9660
    @preetimoolchandani9660 5 лет назад

    You are too good man .In exams I got full marks in test thankyou so much

    • @dostotussigreatho
      @dostotussigreatho  5 лет назад

      Hi Preeti, You made my day! I am so happy so you. This is the reason why I make these videos. I am glad you liked the video and it helped you get FULL marks in the exams! Thank you very much for your feedback. I appreciate it. I wish you the very best in the future! Pls do check out my other videos when you have some time and let me know what you think! Cheers,

    • @dostotussigreatho
      @dostotussigreatho  4 года назад

      Hi Preeti,
      Pls check out new playlists that contain all videos for Class-9 Math for Numbers, Polynomials, Coordinate Geometry, Linear equations, Intro Euclid's geometry, Lines and Angles, Traingles, Quadrilaterals, Areas of Parallelograms and more. Hope you like the videos. When you get a chance, pls do share your feedback. It would be great to hear from you. Thanks! Cheers,

  • @thakurgautam1268
    @thakurgautam1268 5 лет назад

    Please learn all theorum of ch=7 of ncert book

    • @dostotussigreatho
      @dostotussigreatho  5 лет назад

      Hi Gautam,
      All those videos have been made and uploaded in the channel. For example,
      Vertically opposite angles are always equal - Theorem (1 of 2)
      ruclips.net/video/F6mfqZdm-Lo/видео.html
      Vertically opposite angles are always equal - Theorem (2 of 2)
      ruclips.net/video/xvDkTOtby5I/видео.html
      In parallel lines, alternate interior angles are always equal (Theorem)
      ruclips.net/video/E4nXRu0u9Gs/видео.html
      Alternate interior angles equal means Parallel lines (Theorem)
      ruclips.net/video/5M7wNst7Akk/видео.html
      Interior angles on same side of transversal are supplementary (Theorem)
      ruclips.net/video/KjZcGdewYoM/видео.html
      Interior angles on same side of transversal supplementary means Parallel lines (Theorem)
      ruclips.net/video/ZmBy5iKmR-A/видео.html
      Lines parallel to same line are parallel to each other (Theorem)
      ruclips.net/video/sGF3a-dqDBg/видео.html
      Exterior angle equals sum of two interior opposite angles (Theorem)
      ruclips.net/video/4zoH26OTVCI/видео.html
      Please share your thoughts, comments. Cheers,

  • @debenboro486
    @debenboro486 5 лет назад +1

    Not bad nice

  • @garginagle2907
    @garginagle2907 4 года назад +1

    Hum apke dost aur host😝😝😜😜

  • @rishiverma7657
    @rishiverma7657 5 лет назад

    Thanks sir

    • @dostotussigreatho
      @dostotussigreatho  5 лет назад

      Hi Rishi, You are very welcome! I am glad you liked the video and found it helpful! Cheers,

    • @dostotussigreatho
      @dostotussigreatho  4 года назад

      Hi Rishi,
      Pls check out new playlists that contain all videos for Class-9 Math for Numbers, Polynomials, Coordinate Geometry, Linear equations, Intro Euclid's geometry, Lines and Angles, Traingles, Quadrilaterals, Areas of Parallelograms and more. Hope you like the videos. When you get a chance, pls do share your feedback. It would be great to hear from you. Thanks! Cheers,

  • @_m1st_19
    @_m1st_19 2 года назад +1

    Better watch in 1.75x speed

  • @puneetmishra9103
    @puneetmishra9103 6 лет назад +2

    It was nice sir

  • @citizpradhan7830
    @citizpradhan7830 3 года назад

    Class = 8 roll no =15 Section-A name citiz Pradhan

  • @jupihajong8261
    @jupihajong8261 5 лет назад +1

    Your teaching is so good sir thank you

    • @dostotussigreatho
      @dostotussigreatho  5 лет назад

      Hi Jupitora - You are very welcome! Glad you liked the videos. Thank you very much for such a wonderful comment. Please check out ALL videos at ruclips.net/user/dostotussigreathovideos and share your feedback as and when you get to watch home. Please share these videos and YT channel with friends who you think may like them. Cheers,

    • @dostotussigreatho
      @dostotussigreatho  4 года назад

      Hi Jupitora,
      Pls check out new playlists that contain all videos for Class-9 Math for Numbers, Polynomials, Coordinate Geometry, Linear equations, Intro Euclid's geometry, Lines and Angles, Traingles, Quadrilaterals, Areas of Parallelograms and more. Hope you like the videos. When you get a chance, pls do share your feedback. It would be great to hear from you. Thanks! Cheers,

  • @snigdhamohanta1391
    @snigdhamohanta1391 6 лет назад +4

    your teaching is good

  • @koraputiyavendiya4533
    @koraputiyavendiya4533 6 лет назад +1

    nice one re keep doing this

  • @surrshsuresh5073
    @surrshsuresh5073 5 лет назад +1

    😆

  • @pinkikanwar9147
    @pinkikanwar9147 6 лет назад +1

    What is the degree of zero polynomials

  • @Joshi.aaditya123
    @Joshi.aaditya123 4 года назад +1

    Who is of kv like here

  • @manishavishe5815
    @manishavishe5815 6 лет назад

    very nice sir

  • @studytech4994
    @studytech4994 6 лет назад +2

    Pq is straight line but it's linear pair

    • @brothers1644
      @brothers1644 5 лет назад

      It's not linear pair it is angles on the straight line

  • @saumyasingh1559
    @saumyasingh1559 5 лет назад

    Excellent

  • @pinkikanwar9147
    @pinkikanwar9147 6 лет назад

    If a+b+c = 0 prove that a3+b3+c3 =3abc

  • @prashantthinge953
    @prashantthinge953 5 лет назад

    Nice teaching

    • @dostotussigreatho
      @dostotussigreatho  5 лет назад

      Prashant - Glad you liked the videos and found them helpful! Please check out all videos at ruclips.net/user/dostotussigreathovideos and share your feedback. Thanks again. Cheers,

  • @prsclasses9190
    @prsclasses9190 6 лет назад

    Good

  • @MrCoolSwimmer
    @MrCoolSwimmer 3 года назад

    painful to listen to

  • @adilnazirpandithmuhammad2989
    @adilnazirpandithmuhammad2989 6 лет назад

    miss

  • @mohammadiatextiles5399
    @mohammadiatextiles5399 4 года назад +2

    Teacher sa zya da boring to aap hi Dara sir 😴😴😴😴😴😴😴

  • @shashiraizada885
    @shashiraizada885 4 года назад

    O 99õ

  • @sangitagupta8944
    @sangitagupta8944 5 лет назад

    Itna detail mai kyu ghuste ho simple se question mai itna time shame on you.....

  • @bhanupriya1161
    @bhanupriya1161 5 лет назад

    Kitana palate ho ap

  • @harmeetkaur7010
    @harmeetkaur7010 6 лет назад +1

    Thanks

  • @saumyasingh1559
    @saumyasingh1559 5 лет назад

    It will helpful to me

    • @dostotussigreatho
      @dostotussigreatho  5 лет назад

      Saumya - Glad you liked the video and found it helpful. Please check ALL other videos at ruclips.net/user/dostotussigreathovideos and share your feedback. Thanks again. Cheers,

  • @befantastic.BF.
    @befantastic.BF. 4 года назад

    Thank you so much sir

  • @kainatiqbal5055
    @kainatiqbal5055 5 лет назад +1

    Good

    • @dostotussigreatho
      @dostotussigreatho  5 лет назад

      Iqbal - Glad you liked the video and found it helpful! Cheers,

  • @poonamsingh7708
    @poonamsingh7708 6 лет назад +1

    Thanks