Question

A car has a tyre of diameter 28 cm. ___ km is covered by the car if the tyre rotates 150 times. (Use $\pi$ = 22/7)

Answer 1

Circumference of a circle of radius $r$ cm = $2\pi r$ cm
Thus, circumference of the tyre = $2\pi r$ = Distance covered in each rotation

i.e., Distance covered in 1 rotation = $2\times \pi \times 14$ = 88 cm

Distance covered in 150 rotation = 88 $\times$ 150 = 13200 cm = 0.132 km