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In mathematics, '''Pappus' centroid theorem''' (also known as  the '''Guldinus theorem''', '''Pappus–Guldinus theorem''' or '''Pappus' theorem''') is either of two related [[theorem]]s dealing with the [[surface area]]s and [[volume]]s of [[Surface_of_revolution|surface]]s and [[Solid_of_revolution|solid]]s of revolution.


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The theorem is attributed to [[Pappus of Alexandria]] and [[Paul Guldin]].
 
==The first theorem==
The first theorem states that the [[surface area]] ''A'' of a [[surface of revolution]] generated by rotating a [[plane curve]] ''C'' about an [[axis of rotation|axis]] external to ''C'' and on the same plane is equal to the product of the [[arc length]] ''s'' of ''C'' and the distance ''d'' traveled by its [[Centroid|geometric centroid]].
 
: <math>A = sd.\,</math>
 
For example, the surface area of the [[torus]] with minor [[radius]] ''r'' and major radius ''R'' is
 
: <math>A = (2\pi r)(2\pi R) = 4\pi^2 R r.\,</math>
 
==The second theorem==
The second theorem states that the [[volume]] ''V'' of a [[solid of revolution]] generated by rotating a [[plane figure]] ''F'' about an external axis is equal to the product of the area ''A'' of ''F'' and the distance ''d'' traveled by its geometric centroid.
 
: <math>V = Ad.\,</math>
 
For example, the volume of the [[torus]] with minor radius ''r'' and major radius ''R'' is
 
: <math>V = (\pi r^2)(2\pi R) = 2\pi^2 R r^2.\,</math>
 
==External links==
*{{MathWorld|title=Pappus's Centroid Theorem|urlname=PappussCentroidTheorem}}
 
[[Category:Theorems in calculus]]
[[Category:Geometric centers]]
[[Category:Theorems in geometry]]

Revision as of 13:02, 11 January 2014

In mathematics, Pappus' centroid theorem (also known as the Guldinus theorem, Pappus–Guldinus theorem or Pappus' theorem) is either of two related theorems dealing with the surface areas and volumes of surfaces and solids of revolution.

The theorem is attributed to Pappus of Alexandria and Paul Guldin.

The first theorem

The first theorem states that the surface area A of a surface of revolution generated by rotating a plane curve C about an axis external to C and on the same plane is equal to the product of the arc length s of C and the distance d traveled by its geometric centroid.

For example, the surface area of the torus with minor radius r and major radius R is

The second theorem

The second theorem states that the volume V of a solid of revolution generated by rotating a plane figure F about an external axis is equal to the product of the area A of F and the distance d traveled by its geometric centroid.

For example, the volume of the torus with minor radius r and major radius R is

External links



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