## Elementary Geometry for College Students (6th Edition)

Given the area of the circle = 56.35 $in^{2}$ to find the approximate lengths of the radius and the diameter of a circle The area A of a circle whose radius has length r is given by A = $\pi r^{2}$ 56.35 = $\pi r^{2}$ $r^{2}$ = $\frac{56.35}{3.14}$ r = $\sqrt 17.94$ = 4.23 in The radius of the circle r = 4.23 in The diameter of the circle = 2 * r = 2 * 4.23 = 8.470 in