The goal of this article is to formalize some theorems that are in the [17] on the web. These are elementary theorems included in every handbook of Euclidean geometry and trigonometry: the law of cosines, the Heron's formula, the isosceles triangle theorem, the intersecting chords theorem and the Ptolemy's theorem.MML identifier: EUCLID 6, version: 7.8.09 4.97.1001
@article{bwmeta1.element.doi-10_2478_v10037-008-0014-2,
author = {Marco Riccardi},
title = {Heron's Formula and Ptolemy's Theorem},
journal = {Formalized Mathematics},
volume = {16},
year = {2008},
pages = {97-101},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.doi-10_2478_v10037-008-0014-2}
}
Marco Riccardi. Heron's Formula and Ptolemy's Theorem. Formalized Mathematics, Tome 16 (2008) pp. 97-101. http://gdmltest.u-ga.fr/item/bwmeta1.element.doi-10_2478_v10037-008-0014-2/
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