we know that [length of a circumference]=2*pi*r diameter=90 cm-------------> r=d/2--------> r=45 cm [length of a circumference]=2*pi*45----------> 90*pi cm
with 1 revolution will go the length of the wheel
if 1 revolution is-------------------> 90*pi cm 5 revolution is--------------------> X X=5*90*pi----------> 1413 cm
