π 2 ⋅ 180 ∘ π = / c d o t 2 / c d o t 2 ⋅ 3 ⋅ 3 ⋅ 3 π = 90 ∘ {\displaystyle {\frac {\pi }{2}}\cdot {\frac {180^{\circ }}{\pi }}={\frac {/cdot{\cancel {2}}/cdot{2}\cdot {3}\cdot {3}\cdot {3}}{\pi }}=90^{\circ }}
