12. Segments are congruent if they have same
13. It is the union of two non-collinear rays called sides with a common endpoint called vertex
12)Two line segments are congruent if they have the same length. They do not need to have the same position or orientation.
13.)An angle is the union of two noncollinear rays with a common endpoint. The common endpoint is called the vertex of the angle, and the rays are called the sides of the angle.
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