A 10m long iron pipe has an exterior radius of 30cm and interior radius of 20cm. Find the whole surface area of the pipe.

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Solution

The whole Surface Area of the pipe =2πRh+2πrh+2π(R2−r2)

Where The height is h=10m=1000cm
(1m=100cm)
R is the exterior radius=30cm
r is the interior radius= 20cm
So surface area of pipe =2πRh+2πrh+2π(R2−r2)=2×3.14×30×1000+2×3.14×20×1000+2×3.14×(30^2−20^2) =3,17,140 cm^2 or 31.71 m^2.

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