Question

wheel of radius 50cm is rolling on a surface,when tthe wheel has rotated by 270 Degree the distance covered by the wheel will be the

Answer 1

The radius of the wheel is 50cm...................(given)
We know that the length of a sector of a circle = $\frac{\Theta }{360}\times 2\mathrm{\pi r}$
Here the $\Theta$ is 270^o that means
distance covered by the wheel = $\frac{270}{360}\times 2\times \mathrm{\pi }\times \mathrm{r}$
distance covered = $75\mathrm{\pi }$cm