Answer
$y=\sqrt {4-x^2}+2$
Work Step by Step
We start with $x^2+(y-2)^2=4$.
Subtract $x^2$ from both sides.
$(y-2)^2=4-x^2$
Take the square root of both sides.
$y-2=\sqrt {4-x^2}$
Add 2 to both sides.
$y=\sqrt {4-x^2} + 2$
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