CK12 - Geometry

7. [Diff: 2]


8. and add up to [Diff: 2].
   9.. is an alternateinterioranglewith [Diff:3].
   10.. is an alternateinterioranglewith the labeled [Diff:3].
   11.. is a linearpair with [Diff:3].
   12.. Use the trianglesum theoremwith and solvefor [Diff:3].
   13.. Use the trianglesum theoremwith [Diff:3].


9. We will provethis usinga two-columnproof.

Statement Reason

1. Given


2. 
   


3. 
   
   
   
   2. TriangleSum Theorem
   
   
   
   


4. 
   
   
   
   3. LinearPair Postulate
   
   
   
   


5. 
   
   
   
   4. Substitution
   
   
   
   


6. Subtractionpropertyof equality(subtracted on both
   sides)

5.

CongruentFigures

LearningObjectives

• Definecongruencein triangles.


• Createaccuratecongruencestatements.


• Understandthat if two anglesof a triangleare congruentto two anglesof anothertriangle,the remaining
  angleswill also be congruent.