Posted by **Anonymous** on Sunday, November 18, 2007 at 12:43am.

The radius of a circle is increasing at a nonzero rate, and at a certain instant, the rate of increase in the area of the circle is numerically equal to the increase in its circumstance. At this instant, the radius of the cirle is...

Here is what I did: (unsure)

pi(r^2)=2pi(r)

r^2-r=0

r(r-2)=0

r=2

## Answer This Question

## Related Questions

- Calculus - The radius of a circle is increasing. At a certain instant, the rate ...
- businessmathamatics - using derivative as a rate measure prove the following'if ...
- calculus - 3. The radius r of a sphere is increasing at a constant rate of 0.04 ...
- Calculus - A spherical balloon is being inflated so that, at the time when the ...
- calculas - At time t=0 s, the radius of a circle is equal to 15 cm. The radius ...
- Calculus I - Let A be the area of a circle with radius r that is increasing in ...
- Precalculus - Hey so I need help on a problem from an assignment that my ...
- math - The area of a circle is given by the formula A = ðr2, where r is the ...
- Algebra - The area of a circle is given by the formula A+pier^2, where r is the ...
- Calculus - if the surface area of a sphere is given by the formula SA=4pir^2, ...

More Related Questions