The belt drives the small wheel so long that it takes 28.26 decimeters for the small wheel to turn once.
So the wheel has 18π/28.26=2 revolutions.
2) The total length of turning circles at both ends of the runway is 400- 130×2= 140.
That is, the circumference of a circle is140m.
Then the diameter is140/π = 44.6 m.
If you have any questions, just ask.
One-person teaching version of the eighth grade mathematics summer homework answer.
(1) Basic concepts: