Wheel diameter

A 1m diameter wheel rolled along a 100m long track. How many times did it turn?

Result

n =  31.831

Solution:

$D=1 \ \text{m} \ \\ o=\pi \cdot \ D=3.1416 \cdot \ 1 \doteq 3.1416 \ \text{m} \ \\ s=100 \ \text{m} \ \\ n=s/o=100/3.1416 \doteq 31.831$

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