## Precalculus (6th Edition) Blitzer

The measure of the central angle θ = $\frac{length of the intercepted arc}{radius}=\frac{s}{r}.$ s = 400 centimeters = 4 meter, r = 1 meter. θ = $\frac{s}{r}$ = $\frac{4}{1}$= 4 radians.