6.1 Angles and Their Measure/51

Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://en.wikipedia.org/api/rest_v1/":): {\displaystyle \frac{180^{\circ}}{\pi}\cdot\frac{\pi}{\cancel{2}}=\frac{\cancel{2} \cdot {2} \cdot {3} \cdot{3} \cdot {3}}{\pi} = 90^{\circ} }