Geometry and TrigonometryMediumVolume of a tank with an approximate pi
Geometry and Trigonometry practice question
A cylindrical water tank has a radius of 3 metres and a height of 5 metres. Using 3.14 for π, what is the volume of the tank, to the nearest cubic metre?
Answer: 141
3.14 × 3² × 5 = 141.3, which rounds to 141.
Common wrong answers
- If you answered 47
- 47 uses r instead of r².
- If you answered 94
- 94 uses 2πrh, the curved surface area.
- If you answered 282
- 282 doubles the volume.
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