Question

Which of the following circles has the greatest circumference Use 3.14 for π

Answer 1

The formula for the circumference of circe with radius r is,

`C=2\pi r`

A)

Determine the circumference of circle with radius 4 meters.

`\begin{gathered} C=2\pi\cdot4 \\ =2\cdot3.14\cdot4 \\ =25.12 \end{gathered}`

B)

Determine the circumference of circle with diameter 7 m.

`\begin{gathered} C=2\pi\cdot(7)/(2) \\ =2\cdot3.14\cdot3.5 \\ =21.98 \end{gathered}`

C)

The circumference of the circle is 24 m.

D)

Determine the circumference of circle in decimal.

`\begin{gathered} C=5\pi \\ =5\cdot3.14 \\ =15.7 \end{gathered}`

The greatest circumference is 25.12. So the greatest circumference is of circle with radius 4 meters.

First option is correct.