Question

If D, G and R denote respectively the number of degrees, grades and radians in an angle, then
(a) $\frac{D}{100}=\frac{G}{90}=\frac{2R}{\mathrm{\pi }}$
(b) $\frac{D}{90}=\frac{G}{100}=\frac{R}{\mathrm{\pi }}$
(c) $\frac{D}{100}=\frac{G}{100}=\frac{2R}{\mathrm{\pi }}$
(d) $\frac{D}{90}=\frac{G}{100}=\frac{R}{2\mathrm{\pi }}$

Answer 1

(c) $\frac{D}{90}=\frac{G}{100}=\frac{2R}{\mathrm{\pi }}$

It is the relation between degree, grade and radian.