Solution 4.1:8
From Förberedande kurs i matematik 1
Because the wheel's circumference is
\displaystyle 2\pi \centerdot
radius metres metres
the wheel turns \displaystyle \pi metres on each revolution, and in \displaystyle \text{1}0 metres the wheel therefore turns
\displaystyle \frac{10\ \text{metres}}{\pi \ \text{metres}}=\frac{10}{\pi }\approx 3.2
revolutions
