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

C = 10$\pi$ in A = 25$\pi in^{2}$
Given the diameter of the circle = 10 in So radius = $\frac{d}{2}$ = 5 in The circumference of the circle is given by the formula c= $\pi$ d = 2$\pi$ r =2$\pi$ * 5 = 10$\pi$ in The area A of a circle whose radius has length r is given by A = $\pi r^{2}$cm = $\pi 5^{2}$ =25$\pi in^{2}$