240 ∘ ⋅ π 180 ∘ = 5 ⋅ 2 ⋅ 2 ⋅ 3 ⋅ 2 ⋅ 2 1 ⋅ π 2 ⋅ 2 ⋅ 5 ⋅ 3 ⋅ 3 = 4 π 3 {\displaystyle 240^{\circ }\cdot {\frac {\pi }{180^{\circ }}}={\frac {{\cancel {5}}\cdot {\cancel {2}}\cdot {\cancel {2}}\cdot {\cancel {3}}\cdot 2\cdot 2}{1}}\cdot {\frac {\pi }{{\cancel {2}}\cdot {\cancel {2}}\cdot {\cancel {5}}\cdot {\cancel {3}}\cdot 3}}={\frac {4\pi }{3}}}
