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Prove that the angle at the circumference is always 90 0

Prove that the angle at the circumference is always 90 0. P. ?. That is, no matter where you place point P, the angle ? is always 90 0. A. B. O. Note: AB is the diameter of the circle whose centre is at O. P. Prove that the angle at the circumference is always 90 0.

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