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Chapter 4
Section 4.2
Objectives
• Discover a relationship between the base
angles of an isosceles triangle.
Properties of Special Triangles
Vertex angle
Legs
Base angles
Base
Investigation
Base Angles in an Isosceles Triangle
p. 205
Isosceles Triangle Conjecture
If a triangle is isosceles, then its
_______________.
base angles are congruent
Investigation
Is the Converse True?
p. 206
Converse if the Isosceles Triangle Conjecture
If a triangle has two congruent angles, then
it is an isosceles triangle
_______________.
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