Download - Chapter 4 - Congruent Triangles
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Chapter 4 - Congruent Triangles
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4.1 - Congruent Figures
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Congruent figures have the same size and shape.
Congruent polygons have congruent corresponding parts - their matching sides and angles.
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When you name congruent polygons, always list corresponding vertices in the same order.
ABC QTR
A Q
B T
C R
AB QT
BC TR
AC QR
R
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Given CAT DOG, what can you conclude?
C D
A O
T G
CA DO
AT OG
CT DG
ATC OGD
TCA GDO
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Triangles are congruent when they have three pairs of congruent corresponding sides and three pairs of congruent corresponding angles.
Find two congruent triangles:
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Theorem 4-1
If two angles of one triangle are congruent to two angles of another triangle, then the third angles are congruent.
A
B
C D
E
F
C F
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Can you conclude these figures are congruent?
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Find the measure of the missing angles. The two figures are congruent.
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Find the measure of the missing angles. The two figures are congruent.
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Tell why each statement is true.
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Homework
p. 182
3 - 13, 16 - 28, 32 - 35