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1.
HW-Isosceles & Equilateral Worksheet
Ch. 4 review
Ch. 4 Test FRIDAY!
www.westex.org HS, Teacher Website
12-7-11
Warm up—GEO CPA
2.
GOAL:
I will be able to:
1. prove theorems about isosceles and
equilateral triangles.
2. apply properties of isosceles and equilateral
triangles.
HW-Isosceles & Equilateral Worksheet, Ch. 4 review
Ch. 4 Test FRIDAY!
www.westex.org
HS, Teacher Website
Name _________________________
Date ________
Geometry CPA
4-8 Isosceles & Equilateral Triangles
Recall that an isosceles triangle has at least two congruent sides. The congruent sides are
called the __________. The ____________________ is the angle formed by the legs. The
side opposite the vertex angle is called the __________, and the ____________________
are the two angles that have the base as a side.
3 is the vertex angle.
1 and 2 are the base angles.
Example 1: Finding the Measure of an Angle
1. Find mF.
2. Find mG.
YOU TRY:
a) Find mH.
b) Find mN.
The following corollary and its converse show the connection between equilateral triangles and
equiangular triangles.
Example 2: Using Properties of Equilateral Triangles
1. Find the value of x.
YOU TRY:
Find the value of JL.
2. Find the value of y.
4-8 Practice
EXIT TICKET
Name _______________________ 12-7-11
Use the figure to the right to name the following segments and angles.
__
__
__
ED & EF
_______
DF
_______
<D & < F _______ ________
EXIT TICKET
<E ________ _______
Name _______________________ 12-7-11
Use the figure to the right to name the following segments and angles.
__
__
__
ED & EF
_______
DF
_______
<D & < F _______ ________
EXIT TICKET
<E ________ _______
Name _______________________ 12-7-11
Use the figure to the right to name the following segments and angles.
__
__
__
ED & EF
_______
DF
_______
<D & < F _______ ________
EXIT TICKET
<E ________ _______
Name _______________________ 12-7-11
Use the figure to the right to name the following segments and angles.
__
__
__
ED & EF
_______
DF
_______
<D & < F _______ ________
<E ________ _______