Question

Adriana found a gold coin with a radius of 9 millimeters. What is the coin's area?

Use 3.14 for ​. If necessary, round your answer to the nearest hundredth.

Answer 1

The formula for finding the circumference of a circle is C = 2
`\pi`r

It is fairly easy to find your answer using the information you have provided. All you need to do is substitute your radius into the formula I have provided above.

It'll look something like this: C = 2(3.14)(9)

Always remember that by using pi alone, you will get an answer that wouldn't be classified as correct. Use 3.14 instead.

C = 2(3.14)(9) = 56.66