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A circle has a radius of 7ft. What is its circumference?Use 3.14 for it, and do not round your answer. Be sure to include the correct unit in your answer.7ft

A Circle Has A Radius Of 7ft What Is Its CircumferenceUse 314 For It And Do Not Round Your Answer Be Sure To Include The Correct Unit In Your Answer7ft class=

Sagot :

The circumference of a circle with radius r is given by:

[tex]C=2\pi\cdot r[/tex]

The area of a circle with raidus r is given by:

[tex]A=\pi\cdot r^2[/tex]

Then for a cirlce of radius 7ft we have a circumference of:

[tex]C=2\pi\cdot7ft=2\cdot3.14\cdot7ft=43.96ft[/tex]

And an area of:

[tex]A=\pi\cdot(7ft)^2=3.14\cdot49ft^2=153.86ft^2[/tex]

Then the answers are:

Circumference: 43.96ft

Area: 153.86ft²

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