sphere problem 1:
A sphere has a radius of 8 cm.
a) calculate the surface area
b) calculate the volume
answer surface area:
A = 4 * r² * π
A = 4 * 8² * π
A = 804.25 cm².
A: The surface area is 804.25 cm².
answer volume:
V = 4 * r³ * π : 3
V = 4 * 8³ * π : 3 (π = 3.1415..)
V = 2 144.66 cm³
A: The volume is 2 144.66 cm³.