Proving a volume of a cylinder

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SUMMARY

The volume of a cylinder can be expressed as v = A² / (4πh), where h represents the height of the cylinder and A denotes the area of the original paper used to form the cylinder. This relationship is derived from the standard volume formula v = πr²h by manipulating the area of the paper, A = 2πrh, and substituting it into the volume equation. The discussion emphasizes the importance of understanding the geometric relationships and transformations involved in deriving these formulas.

PREREQUISITES
  • Understanding of basic geometry, specifically the formulas for the volume and surface area of a cylinder.
  • Familiarity with algebraic manipulation and solving equations.
  • Knowledge of the relationship between the radius, height, and area of a cylinder.
  • Basic understanding of precalculus concepts, particularly those related to functions and transformations.
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  • Study the derivation of the volume formula for a cylinder, focusing on the relationship between radius, height, and area.
  • Learn about geometric transformations and how they apply to real-world objects like cylinders.
  • Explore the concept of surface area in relation to the volume of three-dimensional shapes.
  • Investigate the use of integrals in calculating volumes of irregular shapes for a deeper understanding of calculus applications.
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Students studying precalculus, educators teaching geometry, and anyone interested in understanding the mathematical principles behind the volume of three-dimensional shapes like cylinders.

rachael
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1. Show that a volume of a clyinder equals to v= A^2 \ (4πh)
where h= height of the cylinder
A = area of a original paper


how would i prove this question?
could anyone please help
thank you

v= πr^2 h -------1
v=A^2 \ (4πh)-----2

i tried to make h da subject but i got 4v^2 = Ar^2 which it does work out
 
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What is the curved surface area of a cylinder ?
Is it the area of paper used ?
 
yes the area of the paper is used
 
Since this is in the precalculus forum, i won't refer to integrals. The regular expression for the volume of a cylinder is nr^2h. The area of the paper is A. Find an expression for A in terms of n, r and h, and simply square that and divide by 4nh to show that this equals the volume of the sylinder.
 
Just for the record, I prefer the integral form, much nicer and easier to understant I find.

~H
 
thank you for your help though
 
what is the meaning of "putting the 2 functions in the parathesis separated by the colon" ?? :bugeye: :bugeye:
 
what's the meaning of
"A = area of a original paper"

yOU skipped the most important part !?
by folding a paper to form a cylinder !? I assume..
A=2πrh
V=πrrh = 2πrh2πrh\4πh = AA\4πh

@.u
 

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