Question

A well of diameter 105cm has a 28cm wide parapet running around it. Find the area of the parapet.

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Answer 1

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Step-by-step explanation:

Answer 2

Answer:

Area of the parapet is $11699 cm^2$

Step-by-step explanation:

Well  diameter = 105 cm

Then the radius of the well will  be $r = \frac{d}{2} =\frac{105}{2} =52.5 cm$

Width of parapet =28 cm

Outer radius of the parapet $R=r+width =52.5+28=80.5 cm$

The area of the parapet is given by

$A=\pi (R^2-r^2)\\A=\pi (80.5^2-52.5^2)\\A=\pi (3724)\\A=11699.29 cm^2$

Area of the parapet is $11699 cm^2$