The radius of a sphere decreases at a rate of 6 m/sec. find the rate at which the surface area decreases when the radius is 20 m. recall that the surface area of a sphere of radius r is given by s = 4πr2

The radius of the sphere decreases at the rate of 6 m/ sec

That is,

Surface Area of the sphere of radius r is given by

Differentiating with respect to t,

the answer

b. they are parallel and will never intersect.

answer: what do you mean