Question

The diameter of a circle is 15 yd what is its circumference?

Answer 1

The circumference of a circle can be calculated by;

`\begin{gathered} C=2\pi r\text{ (when radius is given)} \\ C=\pi d\text{ (when diameter is given)} \\ S\text{ince we were given diameter in the question, then we use } \\ C=\pi d \\ \text{where d=15yd (given)} \\ \pi=3.14 \\ C=3.14*15 \\ C=47.1\text{ yards} \end{gathered}`

Therefore, the circumference of the circle is 47.1 yards.