Question

Find the area and the circumference of a circle with radius 9 ft.

Use the value 3.14 for pie, and do not round your answers. Be sure to include the correct units in your answers.

Answer 1

Answers:

Area = 254.34 square feet

Circumference = 56.52 feet

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Work Shown:

Area = pi*(radius)^2

A = pi*r^2

A = 3.14*9^2

A = 254.34 square feet

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Circumference = 2*pi*(radius)

C = 2*pi*r

C = 2*3.14*9

C = 56.52 feet

The two results are approximate since pi = 3.14 is approximate.

Answer 2

1st area of circle:

`\bold{\ area \ of \ circle \ : \pi r^2}`

`\hookrightarrow \sf (3.14)(9)^2`

`\hookrightarrow \sf 254.34 \ ft^2`

2nd circumference of circle:

`\bold{circumference \ of \ circle \ : \ 2\pi r}`

`\hookrightarrow \sf 2(3.14)(9)`

`\hookrightarrow \sf 56.52 \ ft`

• area of circle = 254.34 ft²

• circumference of a circle = 56.52 ft