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A circle has the area of 19.625 units squared...
pi is 3.14
what is the circumference?

User LaytonGB
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1 Answer

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The formula for the area of ​​a circle:

\pi*r^2, where r is radius of circle

\pi*r^2=19.625|:\pi

r^2=(19.625)/(\pi)|\sqrt{}

r=\sqrt{(19.625)/(3.14)}=2.5
The formula for the circumference of a circle:

2*\pi*r, where r is radius of circle

2*\pi*r=2*3.14*2.5=15.7units squared
As can be seen easily calculated radius of the circle first, and then used this to calculate the circumference of the circle.
User Sierra Alpha
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