Heronian mean

Heronian mean
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Heronian_mean".

The Heronian mean H of two non-negative real numbers A and B is given by the formula:

$H = \frac{1}{3}(A + \sqrt{A B} +B)\,.$

It is named after Hero of Alexandria, and used in finding the volume of a frustum of a pyramid or cone. The volume is equal to the product of the height of the frustum and the Heronian mean of the areas of the opposing parallel faces.

The Heronian mean of the numbers A and B is a weighted mean of their arithmetic and geometric means:

$H = \frac{2}{3}\cdot\frac{A+B}{2} + \frac{1}{3}\cdot\sqrt{A B}\,.$

External links

Mean-Trapezoids Geometric comparison of some mathematical means

References

Bullen, P.S. (2003), Handbook of Means and Their Inequalities, Mathematics and Its Applications (2nd ed.), Berlin, New York: Springer-Verlag, ISBN 978-1-4020-1522-9
Eves, Howard Whitley (1980), Great Moments in Mathematics (Before 1650), Mathematical Association of America, ISBN 978-0-88385-310-8

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