− 5 π 4 ⋅ 180 ∘ π = − 5 π ( 2 ) ⋅ ( 2 ) ⋅ 2 ⋅ 2 ⋅ 5 ⋅ 3 ⋅ 3 π = − 225 ∘ {\displaystyle -{\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 }}
− 5 π 4 ⋅ 1 = − 5 π 4 ⋅ 180 π = − 225 ∘ {\displaystyle -{\frac {5\pi }{4}}\cdot {1}=-{\frac {5\pi }{4}}\cdot {\frac {180}{\pi }}=-225^{\circ }}
