Question

1. 13 ft circumference of a circle area c=2πr 3.14 c=28(13)

Explanation:

Step1: Identify the radius

The radius \( r \) of the circle is given as \( 13 \) ft.

Step2: Calculate the circumference

The formula for the circumference \( C \) of a circle is \( C = 2\pi r \). Substitute \( r = 13 \) and use \( \pi \approx 3.14 \).
\( C = 2\times3.14\times13 \)
First, calculate \( 2\times3.14 = 6.28 \).
Then, \( 6.28\times13 = 81.64 \) ft.

Step3: Calculate the area (if needed, but the problem mentions circumference and area, let's do area too for completeness)

The formula for the area \( A \) of a circle is \( A=\pi r^{2} \).
Substitute \( r = 13 \) and \( \pi\approx3.14 \).
\( A = 3.14\times13^{2} \)
First, calculate \( 13^{2}=169 \).
Then, \( 3.14\times169 = 530.66 \) square feet.

Answer:

• Circumference: \( 81.64 \) ft
• Area: \( 530.66 \) square feet