sphere problem 4:
The volume of a sphere is 104 cm³.
a) calculate the radius
b) calculate the surface area
answer radius:
V = 4 * r³ * π : 3
104 = 4 * r³ * π : 3 / * 3
312 = 4 * r³ * π / : 4
78 = r³ * π / : π
24,282…. = r³ / ³√
r = 2.92 cm.
A: The radius is 2.92 cm.
answer surface area:
A = 4 * r² * π
A = 4 * 2.92² * π
A = 107.15 cm²
A: The surface area is 107.15 cm².