ABC is equilateral triangle.

What is the value of ∠ACD?

A 150°

B 120°

C 90°

D 60°

Solution

Correct Answer: Option B

ABC ত্রিভুজ সমবাহু ত্রিভুজ হলে,
ত্রিভুজটির ∠A = ∠B = ∠C = 60°
অতএব  ∠ACD =  ∠C এর সম্পূরক কোণ
= 180° –  ∠C
= 180° – 60° = 120°

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