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Geometry
4.3
Congruent Triangles
 Congruent polygons - two geometric
figures that have the same shape and
size
 In these, all of the parts of one polygon
are congruent to the corresponding
parts or matching parts of the other.
Ex 1
 Show that the two polygons are congruent by
identifying all congruent corresponding parts. Then
write a congruence statement.
Example 2
 Triangle ABC is congruent to Triangle DEF. Find
the values of x and y.
A
7.5
75̊
65 ̊
F
11
E
6y -14
40 ̊
B
13
C
D
Theorem 4.3: Third angles
 If two angles of one triangle are
congruent to two angles of a second
triangle, then the third angles of the
triangles are congruent.
Theorem 4.4: Properties of
Triangle Congruence
Triangle congruence is:
reflexive
symmetric
transitive
Homework
 Page 257: 4-8 all, 10, 12, 13-20 all,

28, 48-51 all