Question

the inner and Outer radii of a cylindrical pipe is 4 cm and 5 cm respectively find the area of cross section of pipe

Answer 1

This is the correct answer

Answer 2

Area of cross section of pipe is 28.26 square centimeter

Solution:

The area of cross of pipe is given as:

$Area = \pi (R^2 - r^2)$

Where,

R is the radius of outer pipe

r is the radius of inner pipe

From given,

R = 5 cm

r = 4 cm

Substituting the values we get,

$Area = 3.14 (5^2 - 4^2)\\\\Area = 3.14 ( 25 - 16)\\\\Area = 3.14 \times 9\\\\Area = 28.26$

Thus area of cross section of pipe is 28.26 square centimeter

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