Answer
AC$\approx$8.5 or $\sqrt {72}$
Work Step by Step
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
