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math422jan42016.notebook
Happy 2016 !!
January 04, 2016
hw due Tuesday: Geometry p. 138 # 15,16,23,24,27,28 If you need to, use your notes to help you with these questions:
1. What does CPCTC stand for?
2. What are the ways to prove triangles congruent?
3. A pentagon has interior angles with measures 100, 120, 150, (14x+11) and (81­x) degrees. Find x.
4. The measures of some angles are shown.Find x.
x2
75­4x
5­x
A
C
5. Determine if Give a reason for your answer.
62
4x­2 8x­10
B
D
math422jan42016.notebook
January 04, 2016
Recall the vocabulary and 2 theorems we studied just before break:
A
Which angle is the vertex angle in the diagram at left?
Which are the base angles? What is the base?
B
C
If 2 sides of a triangle are congruent, then the angles opposite those sides are congruent. (Base angles of an isosceles triangle are congruent)
If 2 angles of a triangle are congruent, then the sides opposite those angles are congruent.
try these ­
math422jan42016.notebook
January 04, 2016
math422jan42016.notebook
January 04, 2016
C
Given : triangle ABC with Prove: D A B E
math422jan42016.notebook
C
R
January 04, 2016
Given : S
A D B