If $D°$ and $R^{c}$ denote the same angle in sexagesimal and circular systems, then —

• a$\dfrac{D}{\pi} = \dfrac{R}{180}$
• b$\dfrac{D}{180} = \dfrac{R}{\pi}$
• c$\dfrac{D}{360} = \dfrac{R}{\pi}$
• d$\dfrac{D}{90} = \dfrac{R}{\pi}$