The lateral surface area of a cylinder is 94.2 cm sq. and its height is 5cm. Find radius of its base.
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Answer:
LSA of cylinder = 2πrh or 2πr × h
height = 5cm
LSA = 94.2cm²
2πrh = 94.2
2 × 22/7 × r × 5 = 94.2
44/7 × 5 × r = 94.2
r = (94.2 × 7) ÷ (44 × 5)
= 659.4 / 220
= 2.99cm
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