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.

The area of the circular cross section of the pipe is

Step-by-step explanation:

we know that

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

we have

----> the radius is half the diameter

substitute

answer: city needs 2.4 inches of rainfall more to match the record of 40 inches.

step-by-step explanation:

since we have given that

total annual rainfall a city record = 40 inches

this year, total rainfall recorded = 37.6 inches

number of inches of rainfall   is needed to match the record of 40 inches is given by

hence, city needs 2.4 inches of rainfall more to match the record of 40 inches.