Question
A park has a total area of 16,500 m². A cylindrical
roller, with a radius of 7 meters and a length of 15 meters, is used to level the ground. How many complete revolutions must the roller make to cover the entire area once?Solution
ATQ;
Area levelled by the roller in one revolution = curved surface area of the roller
= 2 × π × radius × length = 2 × (22/7) × 7 × 15 = 660 m²
So, number of revolutions needs to level the area of the entire ground = 16500 ÷ 660 = 25
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