Question

I need to equation for the radius of a 400m running track I know the answer is 36.5 and I know the formula is =2//tex.z-dn.net/?f=%20%5Cpi%20" id="TexFormula1" title=" \pi " alt=" \pi " align="absmiddle" class="latex-formula">r

Answer 1

This formula only applies if the track is circular.  If it is, then we write the equation:

2*r*pi=400

Dividing by 2pi, we see that:

r=200/pi

This is approximately 63.66.