π 2 ⋅ 180 ∘ ⋅ 2 ⋅ 2 ⋅ 3 ⋅ 5 π ⋅ π 2 ⋅ 2 ⋅ 5 ⋅ 3 ⋅ 3 = 2 π 3 {\displaystyle {\frac {\pi }{2}}\cdot {\frac {180^{\circ }\cdot {\cancel {2}}\cdot 2\cdot {\cancel {3}}\cdot {\cancel {5}}}{\pi }}\cdot {\frac {\pi }{{\cancel {2}}\cdot {\cancel {2}}\cdot {\cancel {5}}\cdot {\cancel {3}}\cdot 3}}={\frac {2\pi }{3}}}
