Question
The curved surface area of a cylindrical roller is 792
cm². If its height is 18 cm, find the diameter of the roller.Solution
ATQ,
Let the radius of the roller be 'r' cm.
Curved surface area of the cylinder = 2 × π × radius × height
ATQ,
2 × (22/7) × 18 × r = 792
So, r = (792 × 7) ÷ (2 × 22 × 18) = 7
Therefore, diameter of the roller = 2 × r = 2 × 7 = 14 cm
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