Question

A runner lane is exactly 50 feet from the center of a circular race track. The runner needs to run a total of 785 feet. How many laps does the runner need to complete?

Answer 1

we have

so the circumference is:

`\begin{gathered} C=2\pi r \\ C=2\pi\cdot50 \\ C=100\pi \\ C=100(3.14) \\ C=314 \end{gathered}`

therefore:

`n\text{umber of laps=}(785)/(314)=2.5`

answer: 2.5 laps