Question

What is the cicumference of a circle of radius $r$ and diameter $d$?

• A. $\mathrm{\pi r}$
• B. $2\mathrm{\pi r}$
• C. $2\mathrm{\pi d}$

Answer 1

The correct option is B $2\mathrm{\pi r}$

The cicumference of a circle of radius $r$ and diameter $d$ is given by $2\mathrm{\pi r}$ or $\mathrm{\pi d}$