4-5 Theorems
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Converse of the Isosceles Triangle Theorem
If two angles of a triangle are congruent, then the sides opposite those angles are congruent.
Isosceles Triangle Theorem
If two sides of a triangle are congruent, then the angles opposite those sides are congruent
Corollary to Theorem 4-3
If a triangle is equilateral, then the triangle is equiangular
Theorem 4-5
If a line bisects the vertex angle of an isosceles triangle, then the line is also the perpendicular bisector of the base.
Corollary to Theorem 4-4
If a triangle is equiangular, then the triangle is equilateral
