Question: If the radius of a sphere is 3 units, what is its volume?

Options:

1. 27π
2. 36π
3. 9π
4. 18π

Correct Answer: 27π

Solution:

The volume V of a sphere is given by V = (4/3)πr³. Thus, V = (4/3)π(3)³ = (4/3)π(27) = 36π.