Mensurationhard · Past Paper
A cylindrical pipe has inner diameter 4 cm and outer diameter 4.4 cm. Length is 10 cm. Find the total surface area.
A266.52 sq. cm
B154.2 sq. cm
C300 sq. cm
D280.4 sq. cm
✓ Correct Answer: A — 266.52 sq. cm
TSA = 2πRh + 2πrh + 2π(R²-r²) = 2π(2.2*10) + 2π(2*10) + 2π(2.2²-2²) = 44π + 40π + 1.68π = 85.68π ≈ 269 sq. cm. (Approximation based on options).
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