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This Lesson (MOVIE (FLASH) Geometry Proving Triangles Congruent) was created by by nutshellmath(0)
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This movie lesson reminds you five tests of triangles congruency: 1) if tree sides of two triangles are congruent (SSS case); 2) if Side-Angle-Side are congruent (included angle, SAS case); 3) Angle-Side-Angle are congruent (ASA case); 4) Angle-Angle-Side are congruent(AAS case); 5) Hypotenuse-Leg are congruent for two right triangles. Using test number 3, it is proved that the diagonal of the parallelogram divides it in two congruent triangles.
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