Geodesic
Heron's Formula from a 4-Dimensional Perspective
Visual Mathematics, Tome 13 (2011) no. 1 Cet article a éte moissonné depuis la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

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We indicate that Heron's formula (which relates the square of the area of a triangle to a quartic function of its edge lengths) can be interpreted as a scissors congruence in 4-dimensional space.
Classification : 20H15 
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     author = {J. Scott Carter and David Mullens},
     title = {Heron's {Formula} from a {4-Dimensional} {Perspective}},
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J. Scott Carter; David Mullens. Heron's Formula from a 4-Dimensional Perspective. Visual Mathematics, Tome 13 (2011) no. 1. http://geodesic.mathdoc.fr/item/VM_2011_13_1_a1/