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?

The answer is 314.28 cm² (approx.).

Step-by-step explanation:  Given that an engineer is going to install a new water pipe. The diameter of this circular pipe is, d = 20 cm.

We need to find the area 'A' of the circular cross-section of the pipe.

Given, diameter of the circular section is

So, the radius of the circular cross-section will be

Therefore, cross-sectional area of the pipe is

Thus, the answer is 314.28 cm² (approx.).