10: The equation
z = x2 + y2
defines a regular paraboloid. The inequality
z ≥ x2 + y2
then defines its inside. The other inequality
9 ≥ z
cuts away the top of this solid, so the resulting shape looks like a full cup:
![](gif7/ecd7aj2.gif)
Find the right setting for finding its center of gravity.
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