Question

The diameter of a wheel is 1.26m. If this wheel rotates 500 rotations, how long it can travel?

Answer 1

$1.26 \div 2 = 0.63 \\ area \: of \: circe \: = \pi \times {r}^{2} \\ \: \: \: \: \: = \pi \times 0.63 \times 0.63 \\ = 1.24 \\ now \: area \: \times rotation = 1.24 \times 500 = 620 \: metres$