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A linear pair is formed when two adjacent angles have their non-common side in opposite rays. Their measures will always add up to 180 degrees. Vertival angles are formed by two intersecting lines. Two pairs are formed; they are across from each other (not adjacent), and are congruent.
Corollaries, &. CPCTC. Isosceles Triangles Has at least 2 congruent sides. The angles opposite the congruent sides are congruent Converse is also true. The sides opposite the congruent angles are also congruent. This is a COROLLARY. A corollary naturally follows a theorem or postulate. We can prove it if we need to, but it really makes a lot of sense. The bisector of the vertex angle of an isosceles Î´ is the perpendicular bisector of the base.