Mensurationeasy · Past Paper
What is the area of a sheet needed to make an open cylinder (no top) with radius 'r' and height 'h'?
A2πrh
B2πrh + πr²
C2πrh + 2πr²
Dπr²h
✓ Correct Answer: B — 2πrh + πr²
Open cylinder area = CSA + 1 base = 2πrh + πr².
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