Friday

October 24, 2014

October 24, 2014

Posted by **Taeyeon** on Sunday, February 26, 2012 at 4:13pm.

A. 1/4pi B.1/4 C.1/pi D. 1 E.pi

- calculus -
**MathMate**, Sunday, February 26, 2012 at 8:11pmArea = πr²

dA/dr=2πr

dA/dt=dA/dr*dr/dt=2πrdr/dt

So when dA/dt=2dr/dt

2πrdr/dt=2dr/dt

r=1/π

**Answer this Question**

**Related Questions**

calculus - When the area in square units of an expanding circle is increasing ...

Algebra - The area of a circle is given by the formula A+pier^2, where r is the ...

math - Resolved QuestionShow me another » AP Calculus related rates problem? The...

math - The number of square units in the area of circle P is equal to the number...

geometry - Which is the area of a circle with a radius of 5 units? (use 3.14 for...

Calculus AB - The volume V or a cone (V = 1/3 π rČ h) is increasing at a ...

Math - If the radius of a circle is increased by 1 unit, the area of the circle ...

college calculus - 1) each side of a square is increasing at a rate of 6cm/s. At...

Calculus - the area of the first quadrant region bounded by the y-axis, the line...

algebra - A few more question Id like for someone to check please. 1) what are ...