[SPM Maths] May I know to do this? Answer is C


The first step to solve this question is we must know that equilateral triangle means all the angle will be 60° .

180÷3 = 60°

The next step is we must know one of the law of circle


Have a look at the last diagram

Let’s apply the law to the question.

Thus, the answer is C

I hope you can understand :smiley: