Mensurationmedium · Past Paper
What is the surface area of a solid composed of a cylinder and a hemisphere attached to one of its circular bases with common radius 'r' and cylinder height 'h'?
A2πrh + 2πr²
B2πrh + πr² + 2πr²
C2πrh + 3πr²
D2πrh + 4πr²
✓ Correct Answer: B — 2πrh + πr² + 2πr²
TSA = CSA of Cylinder + Area of one base of Cylinder + CSA of Hemisphere = 2πrh + πr² + 2πr² = 2πrh + 3πr².
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