Posted by **christina** on Wednesday, October 25, 2006 at 5:32pm.

the radius of a circle when the numeric values of the circumference and area are equal.

circumference = 2*pi*r

area = pi*r^2

Set them equal and solve for r.

thanks! i understand it now!

2*3.14*r=3.14*r^2

6.28*r=3.14*r^2

r=3.14

Is that right? It doesn't seem to be.

2*3.14*r=3.14*r^2

6.28*r=3.14*r^2

**You are ok to here. **
r=3.14

Is that right? It doesn't seem to be.

**Then divide both sides by 3.14
**

(6.28/3.14)*r=(3.14/3.14)r^2

2*r=1*r^2

Now divide both sides by r

2*(r/r)=(r^2/r)

2*1=r

2=r
*But there is an easier way to have done it. Start at the beginning and we have
*

2*pi*r=pi*r^2

The pi cancels since it is on both sides.

Divide both sides by r to obtain

2=r

I hope this helps.

thanks, it did help!!

the diameter of a bicycle wheel is 26 in. How far will you travel after one complete turn of the wheel?

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