6.1 Angles and Their Measure/53

${\frac {\pi }{12}}={\frac {\pi }{2\cdot 6}}\cdot {\frac {180^{\circ }}{\pi }}{br}={\frac {\cancel {\pi }}{{\cancel {2}}\cdot {6}}}\cdot {\frac {{\cancel {2}}\cdot {2}\cdot {5}{3}\cdot {3}\cdot }{\cancel {\pi }}}\cdot {\frac {\pi }{{\cancel {2}}\cdot {2}\cdot {\cancel {5}}\cdot {\cancel {3}}\cdot 3}}={\frac {\pi }{6}}$