6.1 Angles and Their Measure/51

Failed to parse (Conversion error. Server ("https://en.wikipedia.org/api/rest_") reported: "Cannot get mml. Server problem."): {\displaystyle {\frac {\pi }{2}}\cdot {\frac {180^{\circ }}{\pi }}={\frac {/cdot{\cancel {2}}/cdot{2}\cdot {3}\cdot {3}\cdot {3}}{\pi }}=90^{\circ }}