The region is bounded below by the plane \( z = 0 \), laterally by the cylinder \( x^2 + y^2 = 1 \), and above by the paraboloid \( z = x^2 + y^2 \).
Since the lateral boundary is a cylinder \( x^2 + y^2 = 1 \), it is natural to use cylindrical coordinates:
\[
x
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