Question

Match the circumference (rounded to the nearest meter) on the left to its corresponding circle on the right. Some circumference options on the left will not be used.

Answer 1

The circumference of a circle can be obtained using the formulae

If the radius of the circle is given:

`C=2\pi r`

If the diameter of the circle is given:

`C=\pi D`

From the first circle given

The radius (r) is given to be = 11.5m

Hence, the circumference of the circle is

`C=2*\pi*11.5=72.26`

Hence, c = 72 meters

For the second circle

We were given the diameter of the circle = 12m

Hence, the circumference of the circle is

`C=\pi D=\pi*12=37.69m`

Hence, c = 38 meters

For the third circle

The radius of the circle = 24m

Hence, the circumference of the circle is

`C=2\pi r=2*\pi*24=150.79m`

Hence, c = 151 meters