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Simpler method by circle theorem: angle at centre is twice angle at circumference subtended by same chord. Hence 164/2 = 82. Then 82 - 36 = 46 = equal base angle of isosceles triangle.

Statement II should be disproved as must be true by c = 270 not any other value when c + b = 360 and c - b = 180.

Isosceles triangle formed by 2 radii & chord is divided by its altitude from centre into 2 right-angled triangles with side ratio 3-4-5 giving height = 3. Hence area of triangle = (1/2)(8)(3) = 12. Half of angle at centre = angle of right-angled triangle at centre = Arcsin (4/5) = 53.13. Hence angle of sector = (2)(53.13) = 106.26 The rest is straightforward sector segment calculations.

Given sequential term formula for a sequence, random term can be solved by sequential calculations when term number is small. When term number is large, better solution is by derivation of general term formula which may be difficult under time constraint of exam. Number of dots in rectangle (n) = [3 + 2(n - 1)]∙[3 + (n - 1)] = 2n^2 + 5n + 2 Number of dots to be deducted = sum of odd number sequence from 1 = n^2 Hence number of dots for term(n) = 2n^2 + 5n + 2 - n^2 = n^2 + 5n +2 Answer for this problem with n = 7 is 49 + 35 + 2 = 86

多謝！

邊度找prog

Thx❤

有錯

非常实用，已分享

考试有救了

good！❤

呢題我上年中三都做到

聽日exam來溫返 big thanks

thanks！聽日exam 感謝答疑 同埋好奇個口訣😂

睇咗一集,即刻明白晒,比學校老師仲好

多謝大師😭😭😭

而家中=，去數學比賽睇吓以免會考，我覺得你教得好好，加油！

我就係做唔明點解佢後面個5唔使+0.5/-0.5，睇完2:08明曬👍

唔明喎？ 5:45

想問一下這個找直角的話 一定是要看DEB是否90度嗎？ 為何不能看EDB或DBE是不是90度

要留意下obtuse 既發音

Why did u add 2m?

文字題點睇？

好複雜

想請問a 5:15點解唔用completing square就要prove 4k^2 +16K +92嘅 delta < 0嘅？😮

do you love creating music?

What happen if i press shift 3 😂

6:55 😂

R and s can 調轉？

我最尾嘅area係用返梯形面積公式計：(ST+UV)(diameter of the circle)/2 可能要補個tangent is perpendicular to the radius

bi 用1/2 ab sin c諗得唔得,因為 sinPGH attain maximum at ㄑPGH =90°

想問下依家dse冇用k唔係唔會扣分了咩

thx

Thx a lot , 感恩有您，sensei 💯💯💯

題b 用嗰三個點代入去 點解個答案會唔同？

NICE

唔明😮

Thank U😢終於明啦🎉

明天考

Beyond我素不相識的補習老師！太感謝你了

Thx

Thx

Thx

我想問一條數 2+i/(3+i)(1+3i) in form of a+bi🙏🏻🙏🏻

做10分鐘結果計到1出嚟😵‍💫

This not form 5 meh?

我上堂聽唔明睇啲片好多次，終於睇得明多謝你呀

多謝sir，又救多我一次😭

btw i want to know why here 唔洗知 R and r 的實數。only know the ratio is ok ? i want to know why thank you