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4.2 Congruent Figures

October 15, 2013

4.2 Congruence & Triangles
Congruent Figures: all of the parts in 1 figure are ≅ to the
corresponding parts of the other.

Oct 15­2:30 PM

HW pg. 228 #3­15 odd, 19­21 & 26

1
4.2 Congruent Figures

October 15, 2013

Oct 15­2:34 PM

HW pg. 228 #3­15 odd, 19­21 & 26

2
4.2 Congruent Figures

October 15, 2013

Third Angle Theorem
If 2 angles in one ∆ are = in measure to 2 angles of another ∆,
then the 3 rd angle in each triangle are ≅ .

B

A

C

E

D

F

<A ≅ <D & <B ≅ <E;
therefore <C ≅ <F

Oct 15­2:28 PM

HW pg. 228 #3­15 odd, 19­21 & 26

3
4.2 Congruent Figures

October 15, 2013

Oct 15­2:41 PM

HW pg. 228 #3­15 odd, 19­21 & 26

4
4.2 Congruent Figures

October 15, 2013

Theorem 4.4 Properties of Congruent Triangles
Reflexive: ABC ≅ ABC
Symmetric: If ABC ≅ DEF, then DEF ≅ ABC
Transitive: If

ABC ≅ DEF &
then ABC ≅ JKL

DEF ≅

JKL,

Oct 15­2:39 PM

HW pg. 228 #3­15 odd, 19­21 & 26

5
4.2 Congruent Figures

October 15, 2013

HW pg. 228 #3-15 odd, 19-21 & 26

Oct 15­2:49 PM

HW pg. 228 #3­15 odd, 19­21 & 26

6

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4.1 notes