A certain coin is a circle with diameter 18 mm. What is the exact area of either face of the coin?

Question

asked Oct 8, 2021 57.5k views

1 Answer

Lee Grissom · Answer 1 · 2021-10-11T19:15:15+0000

Answer:

The correct answer is 81.

Explanation:

To find the area of the coin/a circle use this equation:

(a = area, r = radius, d = diameter)

a = r²

So we need to do for the radius.

r = d/2

r = 18/2

r = 9

Then solve

a = 9²

a = 81