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Journal for Geometry and Graphics 21 (2017), No. 1, 045--059 Copyright Heldermann Verlag 2017 Congruence Theorems for Quadrilaterals Francesco Laudano Dip. di Matematica, Università di Salerno, via Giovanni Paolo II 132, 84084 Fisciano, Italy flaudano@unisa.it Giovanni Vincenzi Dip. di Matematica, Università di Salerno, via Giovanni Paolo II 132, 84084 Fisciano, Italy vincenzi@unisa.it We will prove new criterions for the congruence of convex quadrilaterals. Counterexamples show that corresponding results for polygons with more than four vertices do not hold. Keywords: Congruent-like polygons, congruent quadrilaterals, weakly congruent polygons, congruence theorems. MSC: 97G40; 51M04 [ Fulltext-pdf (1053 KB)] |