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In [[geometry]], '''Pedoe's inequality''', named after [[Daniel Pedoe]], states that if ''a'', ''b'', and ''c'' are the lengths of the sides of a [[triangle]] with area ''&fnof;'', and ''A'', ''B'', and ''C'' are the lengths of the sides of a triangle with area  ''F'', then
 
:<math>A^2(b^2+c^2-a^2)+B^2(a^2+c^2-b^2)+C^2(a^2+b^2-c^2)\geq 16Ff,\,</math>
 
with equality [[if and only if]] the two triangles are [[similarity (geometry)|similar]].
 
The expression on the left is not only symmetric under any of the six permutations of the set {&nbsp;(''A'',&nbsp;''a''),&nbsp;(''B'',&nbsp;''b''),&nbsp;(''C'',&nbsp;''c'')&nbsp;} of pairs, but also&mdash;perhaps not so obviously&mdash;remains the same if ''a'' is interchanged with ''A'' and ''b'' with ''B'' and ''c'' with&nbsp;''C''. In other words, it is a symmetric function of the pair of triangles.
 
Pedoe's inequality is a generalization of [[Weitzenböck's inequality]] and of the [[Hadwiger–Finsler inequality]].
 
==References==
* "A Two-Triangle Inequality", [[Daniel Pedoe]], ''The [[American Mathematical Monthly]]'', volume 70, number 9, page 1012, November, 1963.
* "An Inequality for Two Triangles", D. Pedoe, ''[[Proceedings of the Cambridge Philosophical Society]]'', volume 38, part 4, page 397, 1943.
 
==External links==
*[http://www.ele-math.com/files/mia/07-2/full/mia-07-32.pdf Pedoe's inequality]
 
[[Category:Geometric inequalities]]
[[Category:Triangle geometry]]

Latest revision as of 21:21, 21 March 2013

In geometry, Pedoe's inequality, named after Daniel Pedoe, states that if a, b, and c are the lengths of the sides of a triangle with area ƒ, and A, B, and C are the lengths of the sides of a triangle with area F, then

with equality if and only if the two triangles are similar.

The expression on the left is not only symmetric under any of the six permutations of the set { (Aa), (Bb), (Cc) } of pairs, but also—perhaps not so obviously—remains the same if a is interchanged with A and b with B and c with C. In other words, it is a symmetric function of the pair of triangles.

Pedoe's inequality is a generalization of Weitzenböck's inequality and of the Hadwiger–Finsler inequality.

References

External links