## Algebra 1: Common Core (15th Edition)

You have to use the Pythagorean theorem to determine if this is a right triangle. A=18, B=52.5, C=55.5: $a^{2}$+$b^{2}$=$c^{2}$ $18^{2}$+$52.5^{2}$=$55.5^{2}$ -simplify the exponents- 32.4+2756.25=3080.25 -simplify like terms- 3080.25=3080.25 They are equal so yes this is a right triangle.