There are two types of isometries that map A onto D and B onto E: one is direct and the other is opposite. The direct isometry finishes the proof since, then, one triangle is the isometric image of the other.

There are two types of isometries that map A onto D and B onto E: one is direct and the other is opposite. The direct isometry finishes the proof since, then, one triangle is the isometric image of the other.

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