## Elementary Geometry for College Students (7th Edition)

radius = 2.5 ft circumference = 5$\pi$ ft
The area of the circle = 6.25$\pi ft^{2}$ The area A of a circle whose radius has length r is given by A = $\pi r^{2}$ 6.25$\pi$ = $\pi r^{2}$ 6.25 = $r^{2}$ r = 2.5 ft We know the circumference of the circle is given by the formula c= $\pi$ d = 2$\pi$ r = 2$\pi$ * 2.5 = 5$\pi$ ft