Question
A cross-section of a sphere (when cut by a plane through its center) is a circle of area 100pi cm^2 what is the surface area of the sphere ?
Answers
Steve
since for a circle, a = pi r^2 = 100pi, r = 10
for a sphere, a = 4pi r^2 = 400pi
for a sphere, a = 4pi r^2 = 400pi