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Surface Area of Hollow Cylinder

A pillar in t...

Question

A pillar in the shape of a cylinder has radius 21 cm and height 3 cm. Find the curved surface area of the pillar.

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Solution

Pillar is in the form of a cylinder.
Curved Surface area of pillar $= 2 π r h$
where $r = 21$ cm and $h = 3$ cm
Curved Surface area of pillar $= 2 \times \frac{22}{7} \times 21 \times 3 = 396$ sq.cm

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