A circle of radius greater than 9 cm is inscribed in the square ABCD. A point P on the circle is 8 cm from side AB of the square, and 9 cm from side AD. What is the radius of the circle?
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  1. sorry the square got messed up

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  2. that's ok -- we know what a square looks like.

    Looks like we have

    (r-8)^2 + (r-9)^2 = r^2

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