Question

a certain coin is a circle with a diameter of 18mm. What is the exact area of either face of the coin in terms of pi (3.14)

Answer 1

254.34 mm².

Explanation:

For this problem, we use the formula to find the area of a circle, which is
`A=\pi r^2` .
`r` is the radius, which we can find by dividing the diameter by 2 and
`\pi` in this case is 3.14.

`A=\pi r^2\\A=3.14*(18/2)^2\\A=3.14*9^2\\A=3.14*81\\A=254.34`

Therefore, the area of either face of the coin is 254.34 mm².

I hope this helps!