book Maths Puzzle Numerical Ability

please help me cause i forgot how to solve this problem. i will apreciate.

points A, B, and C are on circle P (P is the center of the circle). But points
A, P, and B measure

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book Other Question
Every man on earth has made a certain number of handshakes.Prove that the number of people who have made an odd number of handshakes is even. If N(t)=N(0)a^pi^t

How would you determine:
1) N(0)
2) pi

Thanks