Geometry and TrigonometryHardVolume of a cone as a multiple of pi
Geometry and Trigonometry practice question
A cone has a base radius of 3 and a height of 4. Its volume can be written as kπ. What is the value of k?
Answer: 12
V = (1/3)πr²h = (1/3)π(9)(4) = 12π.
Common wrong answers
- If you answered 4
- 4 uses r instead of r².
- If you answered 9
- 9 is r² alone.
- If you answered 36
- 36 forgets the 1/3.
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