4.2.5 Isosceles and Equilateral Triangles Flashcards
1
Q
legs
A
the congruent sides of an isosceles triangle
2
Q
vertex angle
A
it is the angle formed by the legs (congruent sides) of an isosceles triangle
3
Q
base
A
the side opposite of the vertex angle in an isosceles triangle
4
Q
base angles
A
(of an isosceles triangle) are the two angles that have the base as a side
5
Q
Isosceles Triangle Theorem
A
If two sides of a triangle are congruent, then the angles opposite the sides are congruent.
6
Q
Converse of Isosceles Triangle Theorem
A
If two angles of a triangle are congruent, then the sides opposite those angles are congruent.
7
Q
Equilateral Triangle Theorem
A
If a triangle is equilateral, then it is equiangular.
8
Q
Equiangular Triangle Theorem
A
If a triangle is equiangular, then it is equilateral.
