The congruent sides of an isosceles triangle are called ______________.
The non congruent side of an isosceles triangle is called the _______________.
The two angles at the base of an isosceles triangle are called the _________________.
If two angles at the base of an isosceles triangle congruent, then _______________________.
the angles opposite them are congruent.
If two angles of a triangle are congruent, then ________________________________.
the sides opposite them are congruent.
If a triangle is equilateral, then it is __________.
If a triangle is equiangular, then it is ____________ .
The Isosceles Triangle Theorem
If two sides of a triangle are congruent, then the angles opposite those sides are congruent.
The Isosceles Triangle Theorem (Theorem 4-1) often stated that the base angles of an isosceles triangle are congruent.
* An equilateral triangle is also equiangular.
* An equilateral triangle has three 60° angles.
* The bisector of the vertex angles of an isosceles triangle is perpendicular to the base at its midpoint.
If two angles of a triangle are congruent, then the sides opposite those angles are congruent.
Corollary An equiangular triangle is also equilateral.
SSS - side, side, side
Find interior and exterior angle sum
Find each interior and exterior angle in regular polygons
Find missing interior and exterior angles in irregular polygons
Differentiate between convex and non-convex polygons