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

The area of the circle = 2.25$\pi cm^{2}$ The area A of a circle whose radius has length r is given by A = $\pi r^{2}$ 2.25$\pi$ = $\pi r^{2}$ 2.25 = $r^{2}$ r = 1.5 cm Therefore diameter of the circle = 2r = 2* 1.5 = 3 cm