Analytic Geometry - lengths?

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Square ABCD has sides of length 4, and M is the midpoint of CD . A circle with radius 2 and center intersects a circle with radius 4 and center A at points P and D . What is the distance from P to AD?


Please help - I drew the diagram, but looks kinda wierd, and dunno which line to add for the distance from P to AD.

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