Question
A cylindrical road roller has a diameter of 4 m and a
length of 2 m. It rotates 8 times every minute. Find the area it rolls over in 25 minutes.Solution
ATQ,
CSA = 2 × π × radius × height
= 2 Ă— (22/7) Ă— (4/2) Ă— 2
= 2 × (22/7) × 2 × 2 = (176/7) m²
Area in 1 minute = 8 × (176/7) = 1,408/7 m²
Area in 25 minutes = 25 × (1,408/7) = 35,200/7 = 5,028.57 m²
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