Grade 8 · Math
Find a cylinder’s exact volume
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A cylinder has radius 4 cm and height 2 cm. What is its exact volume?
- 32π cm3
- 31π cm3
- 64π cm3
- 33π cm3
See the answer & why
32π cm3
The circular base has area πr2 = 16π cm2. Multiply by height: 16π × 2 = 32π cm3.
A little hint: Use V = πr2h. Square the radius, then multiply by the height.
The base area is πr²; r is the radius, not the diameter.
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