Chapter 11.5, Problem 3WE

To determine

To Find: The circumference and area.

Answer to Problem 3WE

  $C=5\pi units$

  $A=6.25\pi sq.units$

Explanation of Solution

Given: $r=\frac{5}{2}$

Circumference of a circle

  $\begin{array}{l}C=2\pi r\\ C=2\pi \left(\frac{5}{2}\right)\\ C=5\pi units\end{array}$

Area of circle

  $\begin{array}{l}A=\pi r^2\\ A=\pi {\left(\frac{5}{2}\right)}^2\\ A=\frac{25}{4}\pi \\ A=6.25\pi sq.units\end{array}$