Geometry
posted by George on .
find the radius of a sphere withh the given property.
A.The number of square meters of a surface area equals the number of cubic meters of volume.
B. The ratio of surface area in square meters to volume in cubic meters is 1:5.

we want
4/3 pi r^3 = 4pi r^2
1/3 r = 1
r = 3
next,
4/3 pi r^3 = 5*4pi r^2
1/3 r = 5
r = 15