Question 850445
A tumor in a persons body can be approximated by a spherical shape. Radiation treatments cause the tumor to shrink. As a result, the radius decreases at a rate of 1mm per mo.

a) if the tumor has a radius of 2.5mm, what is the surface area?
{{{SA = 4pi*r^2}}}

b) after two months of radiation, what is its surface area?
> 2 months, r = 0.5 mm