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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, UniversitÓ di Salerno, via Giovanni Paolo II 132, 84084 Fisciano, Italy
flaudano@unisa.it

Giovanni Vincenzi
Dip. di Matematica, UniversitÓ 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

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