# A circular running track has a diameter of 10m. Four laps around the track equals a distance of:

126 m

Explanation

One lap around the track is equal to the circumference of the $${\rm{circle}} = \pi \times {\rm{diameter}} = {\rm{1}}0\pi (m)$$. Four laps around the $$\text { track }=4 \times 10 \pi=40 \pi=126 \mathrm{~m}$$