Question

diameter of a wheel of a car is 70cm how much distance will it cover in 10 rounds

Answer 1

Cirumference = pi * d = 22/7 * 70 = 220 cm
It does 10 round so goes distance of cirumference ten times so 220 *10 = 2200 cm
= 22 m

Answer 2

$d = 70 \: \\ so \\ r = 35 \\ perimetre \: of \: circle = 2\pi \: r \\ = 2 \times 35 \times 3.14 \\ = 219.8 \\ 219.8 cm\times 10 = 2198cm$