A rectangle by is rotated completely about its side of length . What is the total surface area of the solid formed?
Answer and explanation
Correct answer: A.
- Step 1: The solid is a cylinder with radius and height . Step 2. Total surface area . **Answer: . Why not the others:** : This is the cylinder obtained by rotating about the side of length . : This is the curved surface only (or the volume). : This includes one base only: .
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