a) Ae=\(\frac{1}{2}\mid detJ \mid\)
b) & Ae=detJ
c) 2πr
d) 4πr2
Answer: a
Explanation: A ring-shaped object, a region bounded by two concentric circles. … Informally, it has the shape of a hardware washer. The volume of the ring-shaped element is Ae=\(\frac{1}{2}\mid det J \mid\).
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