Question
A hollow cylindrical container has an inner radius of
5.5 cm, a length of 15 cm, and a thickness of 3 cm. Calculate the volume of the container. (Use π = 22/7)Solution
Outer radius of container = 5.5 + 3 = 8.5 cm
Volume of hollow cylinder = π X height X [(outer radius)2  - (inner radius)2]
= (22/7) x 15 x (outer radius + inner radius) X (outer radius - inner radius)
= (22/7) x 15 x (8.5 + 5.5) X (8.5 - 5.5)
= (22/7) x 15 x 14 x 3 = 1,980 cm 3
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