Honors Geometry
Name:________________________
4.4 Class Notes
Date:______________Pd:_________
WARM UP:
1. In an isosceles triangle, if a segment is drawn from the vertex of the angle between the congruent sides
to the midpoint of the opposite side, then congruent triangles are formed.
RS  plane Y
TRS  VRS
Prove: RTV is isosceles
2. Given:
Isosceles Triangle Theorem: __________________________________________
Vertex Angle
__________________________________________________________________
Given:
leg
leg
base angles
base
Prove:
Corollaries from Isosceles Triangle Theorem :
Corollary 1: An equilateral triangle is also ________________________.
Corollary 2: An equilateral triangle has three ___________degree angles.
Corollary 3: The bisector of the vertex angle of an isosceles triangle is
_____________________________________________________.
Converse of Isosceles Triangle Theorem:________________________________
__________________________________________________________________
Corollary 4: An equiangular triangle is also ____________________________
Homework: p.137-139 #1-7 odd, 13-29 odd