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geo ch 4.2.notebook
1
November 14, 2013
Bellwork: How and why are the angles related?
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Chapter 4.2: Apply Congruence and Triangles
Congruent Not Congruent
Figures that are congruent have congruent corresponding parts.
geo ch 4.2.notebook
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November 14, 2013
If Then....
AB
C Z
Y X
ex. Write a congruence statement from the picture and list the corresponding parts.
geo ch 4.2.notebook
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November 14, 2013
ex. In the diagram, DEFG SPQRFind the value of x and y.
ex. If you divide the wall into orange and blue sections along JK, will the sections of the wall be the same size and shape? Explain.
geo ch 4.2.notebook
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November 14, 2013
Theorem 4.3: Third Angles Theorem
If two angles of one triangle are congruent to two angles of another triangle, then the third angles are also congruent.
WHY???? PICTURE???
PROOF...
ex. Find m<BDC
geo ch 4.2.notebook
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November 14, 2013
ex. Write a proofGiven: AD CB, DC BA, <ACD <CAB, <CAD <ACBProve: ΔACD ΔCAB
If and , then
Theorem 4.4: Properties of Congruent Triangles
Reflexive:
Symmetric:
Transitive:
If , then
geo ch 4.2.notebook
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November 14, 2013
Homework: Chapter 4.2 pg.228 #'s 3,58,11,12,16,20,26