Geometry and TrigonometryHardVolume of a cylindrical tank as a multiple of pi
Geometry and Trigonometry practice question
A cylindrical water tank has a radius of 3 metres and a height of 10 metres. Its volume can be written as kπ cubic metres. What is the value of k?
Answer: 90
V = πr²h = π(9)(10) = 90π.
Common wrong answers
- If you answered 30
- 30 uses r instead of r².
- If you answered 60
- 60 uses 2r × h, mixing up circumference with area.
- If you answered 180
- 180 doubles 90.
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