Question

How do you find the circumference, radius, and diameter?

Answer 1

Check the picture below.

`\bf \textit{circumference of a circle}\\\\ C=2\pi r~~ \begin{cases} r=radius\\[-0.5em] \hrulefill\\ r=2.9 \end{cases}\implies C=2\pi (2.9)\implies C=5.8\pi \implies C\approx 18.22 \\\\[-0.35em] ~\dotfill\\\\ ~\hfill \stackrel{C/ r}{18.22/ 2.9 \approx 6.28}\qquad \stackrel{C/ d}{18.22/ 5.8 \approx 3.14}~\hfill`