Question

What is the area of a circle $\pi r^{2}?$

Answer 1

Answer:

To calculate the area of a circle, we have this formula: $\pi r^2$

Let's do an example: Calculate the are of a circle whose diameter is 20 cm.

First, we need to get the radius of the circle. WWe should know the diameter of a circle is equal to $2r$, so the radius is half of the diameter.

If the diameter is 20 cm, then the radius is 10 cm.

Now we have the radius and teh formula $\pi r^2$, so we can calculate:

$\pi * 10^2$ = $\pi* 100$ $\approx$ 314.16 $cm^2$