Question

Find the circumference of this circle.Use 3.14 to approximate .C = 2120 ftC = [?] ft

Answer 1

The diameter of the circle is 20ft.

So, its radius is

$\begin{gathered} r=\frac{20}{2} \\ =10\text{ ft} \end{gathered}$

The circumference of the circle is

$\begin{gathered} C=2\pi r \\ =2\times3.14\times10 \\ =62.8\text{ ft} \end{gathered}$

Hence, the circumference of the circle is C=62.8 ft