Question

AThe formula for the circumference of a circle is C = 2tr. Find the circumference of acircle with a diameter of 4 ft.

Answer 1

Given the formula for the circumference of a circle:

C = 2πr

Let's find the circumference of a circle with a diameter of 4 ft.

Where r is the radius.

To find the radius, we have:

`\text{radius}=\frac{\text{diameter}}{2}=(4)/(2)=2ft`

The radius of the circle is 2 ft.

Take π = 3.14

Hence, to find the circumference of the circle, C, substitute 2 for r, 3.14 for π, and evaluate.

Thus, we have:

`\begin{gathered} C=2\pi r \\ \\ C=2\ast3.14\ast2 \\ \\ C=12.56\text{ ft} \end{gathered}`

Therefore, the circumference of the circle is 12.56 ft

ANSWER:

C. 12.56 ft