Question

The path of a rotating lawnmower blade has a diameter of 24 inches and a circumference of about 75 inches. On a smaller model of the lawnmower, the blade has a circumference of about 12.5 inches. What is the diameter of the model?

Answer 1

The circumference is C = 2 * pi * r
to find the diameter of the model
C/ pi = 2*r
or rewritten to
C/pi = d
Plug in what is given and solve
12.5/3.14 = d
the diameter of the model is approximately 3.98 inches
or 4 inches

Hope this helps :)