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have no idea how to do

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I'd write an expression for the area of the semicircle and an expression for the area of one of the regions that the line AP creates, and set one equal to 1/2 of the other.

You are told AP cuts the area in half. Express that as an equation and see where it leads.
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Use the center of the circle to cut the APB shape in two : a portion of the circle and a triangle. In this way you can express it’s area

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