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HOMEWORK

Look it up on yesterday’s notes!!!!
4-4 ISOSCELES TRIANGLE
THEOREM
Reasons for Warm Up
1)
Given
2)
Definition of Angle Bisector
3)
Reflexive
4)
SAS
5)
CPCTC
PROOFS IN GENERAL
Statement
Reason
Given
Given
Sides or Angles are
congruent
Use the given or the
picture
Triangles are congruent
SSS, SAS, ASA
Sides or Angles are
congruent
CPCTC
There can be more!!!
LET’S LOOK BACK AT THE WARM UP

What kind of triangle is ABC?


Isosceles because two sides are congruent
Is there anything else congruent on the triangle?

Yes, two angles
Theorem: If 2 sides of a triangle are congruent,
then the angles opposite these sides are also
congruent.
 Theorem: If 2 angles of a triangle are congruent,
then the sides opposite these angles are also
congruent.

EXAMPLES
1.
2.
30
x
x
2x + 2
30  x  x  180
x  75
2x  4  x  5
x 9
TOO: FIND X
1)
2)
Find the missing angle.
Figure out the congruent sides.
x = 42
42
62
56
41
62
x
TOO: FIND X
1)
2)
Find the congruent angles.
Find the missing angle.
x
x = 40
70
70
HOMEWORK

Page 137 #1-10, 13-16


#13-14 are 4 steps
Flash Cards:

Isosceles Triangle Theorem