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Please check my answers 1. A triangle has side lengths of 34 in, 20 in, and 47 in. Is the
Triangles that have exactly the same size and shape are called congruent triangles. Two triangles are congruent when the three sides and the three angles of one triangle have the same measurements as three sides and three angles of another triangle. The triangles in Figure 1 are congruent triangles. Figure 1 Congruent triangles.
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The exterior angle theorem is Proposition 1. This is a fundamental result in absolute geometry because its proof does not depend upon the parallel postulate. In several high school treatments of geometry, the term "exterior angle theorem" has been applied to a different result,  namely the portion of Proposition 1.