Question

Find the exact circumference and area of each circle.4 in.

Answer 1

In order to find the circunference of a circle, we can use the formula:

$C=2\pi r$

Where r is the circle radius.

So, using r = 4, we have:

$\begin{gathered} C=2\pi\cdot4 \\ C=8\pi \end{gathered}$

So the circunference is 8π inches.

The area can be calculated using the formula:

$A=\pi r^2$

So we have:

$\begin{gathered} A=\pi\cdot4^2 \\ A=16\pi \end{gathered}$

Area = 16π in².