120 ∘ ⋅ π 180 ∘ = 2 ⋅ 2 ⋅ 2 ⋅ 3 ⋅ 5 1 ⋅ π 2 ⋅ 2 ⋅ 5 ⋅ 3 ⋅ 3 {\displaystyle 120^{\circ }\cdot {\frac {\pi }{180^{\circ }}}={\frac {{\cancel {2}}\cdot {\cancel {2}}\cdot 2\cdot 3\cdot 5}{1}}\cdot {\frac {\pi }{2\cdot 2\cdot 5\cdot 3\cdot 3}}}
