Question
A roller with a cylindrical shape has a diameter of 3.5 m
and length 1.2 m. It completes 18 revolutions each minute. Calculate the area it covers in 15 minutes.Solution
ATQ,
CSA = 2 × π × radius × height
= 2 × (22/7) × (3.5/2) × 1.2
= 2 × (22/7) × 1.75 × 1.2 = (92.4/7) m²
Area in 1 minute = 18 × (92.4/7) = 1,663.2/7 m²
Area in 15 minutes = 15 × (1,663.2/7) = 24,948/7 = 3,564 m²
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