Question

how many times will the wheel of the car rotate ifvthe car runs 88 km if the diameter of the wheel is 7 cm .Find its circumference .

Answer 1

circumference of circle
$2\pi(r) \\ 2 \times \frac{22}{7} \times \frac{7}{2}\\22cm$
distance=88km
$88 \times 1000 \times 100 \: cm \\ 8800000 \: cm$
let number of turn be x
then
$x \times 22 = 8800000 \\ x = \frac{8800000}{22} \\ x = 400000$
numbers of turns are 400000

Answer 2

circumference = π × diameter
=22/7*7
=22cm. ans