Comparing Volumes of Cylinders: Is a Larger Radius or Height More Important?

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SUMMARY

The volume of a cylinder is calculated using the formula V = πr²h. In the discussion, two cylinders are compared: one with a radius of 2 and height of 10, and another with a radius of 1 and height of 20. The calculations show that the first cylinder has a volume of 40π, while the second also calculates to 40π, indicating they are equal in volume. However, the confusion arose from misapplying the formula, specifically using 2r instead of r in the calculation.

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  • Understanding of the volume formula for cylinders (V = πr²h)
  • Basic knowledge of geometry and dimensions
  • Familiarity with mathematical constants, particularly π (pi)
  • Ability to perform algebraic calculations
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bobsmith76
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which is greater or are they equal: one cylinder with 2 radius and height 10, or one with 1 radius and height 20

I thought they would be equal because the first one is

4pi * 10 = 40pi

and the second is

2pi * 20 = 40pi

But my book says the first is greater. don't understand why
 
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Start again. What's the formula for volume of a cylinder?
 
ok, pir^2h not pi(2r)h

now i get it
 

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