Question

How to calculate the circle area?

Answer 1

The formula is
`A=\pi r^(2)`.

Find the radius and you can always find the area.

Remember! radius is half of diameter!

Explanation:

For example:

Lets say that the diameter is 4. Half of 4 is 2. Therefore the radius is two!

Using the formula
`A=\pi r^(2)`,

`A ≈ 12.57`

Hope this helps!

Answer 2

I belive it's
PI r^2
or pie × radius squared