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The circumference of a circle is about 7.85 meters using 3.14 for pi. find the area of the circle. round answer to the nearest hundredth.

Guest Apr 16, 2017
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We need to find the radius

 

Circumference  = 2 * 3.14 * radius

 7.85  =  2 * 3.14 * radius                divide both sides by  2 * 3.14  =  6.28

[7.85 / 6.28 ] m   =  radius

 

And the area, A, is given by :

 

A  =  3.14 * radius^2    =   3.14 * [ 7.85 / 6.28]^2   ≈  4.91 m^2

 

 

cool cool cool

CPhill  Apr 16, 2017
edited by CPhill  Apr 16, 2017

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