Download Properties of Isosceles Triangles

Properties of Isosceles
Triangles
Objectives:
1. Discover a relationship
between the base angles of
an isosceles triangle.
Isosceles Triangle – at least
two sides have the same
length
equilateral triangle –
isosceles triangle with all
three sides are congruent
Parts of Isosceles Triangle:
vertex angle –
between two  sides
Parts of Isosceles Triangle:
base angles – angles
opposite  sides
Parts of Isosceles Triangle:
base – side opposite
vertex
Name each part of the
isosceles triangle below.
Name each part of the
isosceles triangle below.
Name each part of the
isosceles triangle below.
Isosceles Triangle Conj.
If a triangle is isosceles, then
base angles are congruent
_______________________.
Converse of Isosceles Triangle
Conjecture:
If a triangle has two congruent
angles, it is an isosceles
triangle.
Equilateral Triangle Conj.
An equilateral triangle is
equiangular and an
equiangular triangle is
equilateral.
Find the missing angle measures.
ma =
mb=
Find the missing angle measures.
mc =
md=
Find the missing angle measures.
me =
mf =
mg =