Sal shows that a given pair of pentagons are not congruent by showing it's not possible to map one onto the other using rigid transformations.
Determine whether two figures are congruent is a free educational video by Khan Academy.It helps students in grades 8 practice the following standards 8.G.A.2.
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1. 8.G.A.2 : Understand that a two-dimensional figure is congruent to another if the second can be obtained from the first by a sequence of rotations, reflections, and translations; given two congruent figures, describe a sequence that exhibits the congruence between them..