Answer
$ 25 = x^2 +y^2$
Work Step by Step
We solve for $r^2 $ using the values of x and y:
$ r^2 = x^2 +y^2$
$ r^2 = 3^2 +4^2$
$ r^2 = 25$
Thus:
$25 = x^2 +y^2$
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