Geometry Definitions, Postulates, Theorems
2 Isosceles Triangles
the congruent sides of an isosceles triangle
the third side
the other two angles
formed by the two congruent sides
Isosceles Triangle Theorem
If two sides of a triangle are congruent, then the angles opposite those sides
are also congruent
of the vertex angle of an isosceles triangle is the perpendicular
bisector of the base.
Inverse of Isosceles Triangle Theorem
If two angles of a triangle are congruent, then the sides opposite the angles
to Isosceles Triangle Theorem
If a triangle is equilateral, then it is equiangular.
to Converse of Isosceles Triangle Theorem
If a triangle is equiangular, then it is equilate
has three congruent sides. An
three congruent angles.