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what is the circumfrence of a circle with the area 36 pie m squared?

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connorcolin3 | (Level 1) Valedictorian

Posted December 15, 2011 at 12:40 AM via web

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what is the circumfrence of a circle with the area 36 pie m squared?

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hala718 | High School Teacher | (Level 1) Educator Emeritus

Posted December 15, 2011 at 12:45 AM (Answer #1)

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We know that the area of the circle is given by :

`A = r^2 pi.`

`` But we are given that `A= 36pi` .

Then we will substitute into the equation to determine the value of r.

`==gt r^2 pi = 36 pi` .

Reduce `pi` .

`==gt r^2 = 36 `

`==gt r= 6 m`

`` Now we know that the radius r=6 , we will find the circumference.

`==gt C = 2rpi = 2 X 6 X pi = 12 pi.`

`` Then the circumference of the circle is 12`pi`  m.

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