Express the length of a side of Q in terms of the length of a side of P.

Hello. What have you tried or thought about, so far? You could experiment, by letting n=3, to find side lengths of P and Q.

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I would sketch the isosceles triangle formed by one side of P and two radii; then how two sides of Q would relate to that. Then either some trigonometry, or some work with right triangles, should get you started.
 
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