Answer:
D. Congruent triangles may or may not have the same size and shape is not true about congruent triangles. All the other statements are true.
In geometry, congruent triangles are triangles that have the same size and shape. This means that all corresponding parts of the triangles are congruent, including the sides and angles. Congruence for triangles is an equivalence relation, which means that it satisfies the reflexive, symmetric, and transitive properties. In other words, if two triangles are congruent, then they are equal to each other in all respects. If ∆ABC is equilateral, then ∆ABC is congruent to ∆CBA, since an equilateral triangle has all sides and angles equal.
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