Question

Find the distance travelled by a man who walks a semi circular park of 70 m radius twice

Answer 1

Heya !!

Radius of semicircle (r) = 70 m

Distance traveled in one round = $\dfrac{1}{2}{\pi}{r}^2$

Distance traveled in 2 rounds = $2 \times \dfrac{1}{2}{\pi}{r}^2 = \pi r^2 = \dfrac{22}{7} \times 70 \times 70 = 15400 \: m$

Hope it helps !!