Question
Find the length of a wire radius 0.40 cm which can completely cover the surface of a cylinder whose height is 1.6m and base radius 21 cm?
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RBI Grade B 2026 Phase 1 Memory Based Paper
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wire cover the surface is equal to its diameter. 160/0.8 = 200 rounds Length of wire = 2 ×22/7× 21 × 200 = 264 m