A child rolls a ball on a level floor 3.4 m to another child. If the ball makes 9.0 revolutions, what is its diameter?
3 answers
A half revolution (i.e. 180 degrees) would be equivalent to the ball's diameter. Since there are 9 revolutions, the ball have rolled 18 times its diameter.
the distance the ball rolls in one revolution is the circumference, pi D
Opps Damon is right. Remember the equation of a circumference is 2pi(r) and that 2*r=D. Therefore, it could also be written as pi*D