Question

Problem

An engineer is planning a new water pipe installation. The circular pipe has a diameter of d=20\text{ cm}d=20 cmd, equals, 20, space, c, m.

What is the area AAA of the circular cross section of this pipe?

Give your answer in terms of pi.

Answer 1

The area of the circular cross section of the pipe is
`100\pi\ cm^(2)`

Explanation:

we know that

The area of the circle (cross section of the pipe) is equal to

`A=\pi r^(2)`

we have

`r=20/2=10\ cm` ----> the radius is half the diameter

substitute

`A=\pi (10)^(2)`

`A=100\pi\ cm^(2)`