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

AC$\approx$8.5 or $\sqrt {72}$
m$\angle$ABC=90 because the reflex of that angle is equal to 270$^{\circ}$. Therefore ABC is a right triangle. AB=BC=6 inches AB$^{2}$+BC$^{2}$=AC$^{2}$ 6$^{2}$+6$^{2}$=AC$^{2}$ AC=$\sqrt {72}$$\approx$8.5