6.1 Angles and Their Measure/49

$-{\frac {5\pi }{4}}\cdot {\frac {180^{\circ }}{\pi }}={\frac {-5{\cancel {\pi }}}{{\cancel {(2)}}\cdot {\cancel {(2)}}}}\cdot {\frac {{\cancel {2}}\cdot {\cancel {2}}\cdot 5\cdot 3\cdot 3}{\cancel {\pi }}}=-225^{\circ }$

$-{\frac {5\pi }{4}}\cdot {1}=-{\frac {5\pi }{4}}\cdot {\frac {180}{\pi }}=-225^{\circ }$