Question

"Rink Builders" estimates $83 per metre. Calculate the total cost.

20m diameter of a circular shape

Answer 1

keeping in mind that the diameter is 20m, so the radius is half that or 10m.

`\textit{area of a circle}\\\\ A=\pi r^2~~ \begin{cases} r=radius\\[-0.5em] \hrulefill\\ r=10 \end{cases}\implies A=\pi (10)^2\implies A=100\pi \\\\\\ \stackrel{\textit{at \$83 per metre}}{(83)(100\pi )\implies 8300\pi ~~~~\approx~~} \stackrel{\$}{26075.22}`