scientific article; zbMATH DE number 7169366

zbMath1436.52005MaRDI QIDQ5216672

N. S. Astapov, I. S. Astapov

Publication date: 18 February 2020

Full work available at URL: http://mathnet.ru/eng/dvmg404

Title: zbMATH Open Web Interface contents unavailable due to conflicting licenses.

zbMATH Keywords

Ptolemy's inequalityBretschneider theoremarea of an arbitrary quadrilateralBrahmagupta's inequalityequihedral tetrahedrontetron theorem

Mathematics Subject Classification ID

Inequalities and extremum problems involving convexity in convex geometry (52A40) Length, area, volume and convex sets (aspects of convex geometry) (52A38)

Cites Work

• Unnamed Item
• The Remarkable Tetron
• Two Applications of the Generalized Ptolemy Theorem

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