Question

The formula for the circumference of a circle is C- 2. Determine the circumference when the radius r is 10 cm.a.100 g cmC.20 cmb.20x cmd.100 cm

Answer 1

To calculate the circumference of a circle with a radius of 10 cm you have to apply the following formula:

`C=2\pi r`

Where

C is the circumference

r is the radius

π is the number pi

Replace the formula with r=10 and solve:

`\begin{gathered} C=2\pi r \\ C=2\pi\cdot10 \\ C=20\pi cm \end{gathered}`

The circumference of the circle is 20π cm.