Question

Find the missing quantities for the following circle. Use the pi key for pi.

Answer 1

• The radius of the circle is 54.6 cm.

,

• The circumference of the circle is about 171.53 cm.

Explanation:

Given the radius of a circle = 27.3 cm

Diameter

The diameter of a circle is twice the length of the radius.

`\begin{gathered} Diameter=2* Radius \\ =2*27.3 \\ =54.6\;cm \end{gathered}`

The radius of the circle is 54.6 cm.

Circumference

The circumference of a circle with radius, r is calculated using the formula:

`C=2\pi r`

Substitute r=27.3 cm:

`\begin{gathered} C=2*\pi*27.3 \\ =171.53095889 \\ \approx171.53\;cm \end{gathered}`

The circumference of the circle is about 171.53 cm.