The diameter of a circle is 18 cm what is its area in terms of pi

Question

asked Aug 14, 2020 116k views

2 Answers

Illarion Kovalchuk · Answer 1 · 2020-08-19T20:48:03+0000

Answer:

A = 81π cm²

Explanation:

The formula for area of a circle is A = πr², where r is the radius. The radius is half the diameter, so our radius for this problem is

18/2 = 9. So the area is..

A = π(9²) = π(81)

A = 81π cm²