Discussion
The area of a plane region \( R \) as a double integral is
Answer: D
Taking the integrand as one makes each element contribute its own area, so the total is the area itself:
\[ A \;=\; \iint_{R} dA. \]
An integrand of \( x \) or \( y \) gives a first moment instead, from which a centroid is found, and a product \( xy \) gives a product moment
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