Question:
If D, G and R denote respectively the number of degrees, grades and radians in an angle, then
(a) $\frac{D}{100}=\frac{G}{90}=\frac{2 R}{\pi}$
(b) $\frac{D}{90}=\frac{G}{100}=\frac{R}{\pi}$
(c) $\frac{D}{100}=\frac{G}{100}=\frac{2 R}{\pi}$
(d) $\frac{D}{90}=\frac{G}{100}=\frac{R}{2 \pi}$
Solution:
(c) $\frac{D}{100}=\frac{G}{100}=\frac{2 R}{\pi}$
It is the relation between degree, grade and radian.