Question

Problem

Answer 1

Answer:

The area of the circular cross section of the pipe is $100\pi\ cm^{2}$

Step-by-step 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

$A=\pi (10)^{2}$

$A=100\pi\ cm^{2}$