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I don't know what to do

 Jan 10, 2019
 #1
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1. AD is parallel to  BC

    AB is parallel to  DC                                                 Definition of a parallelogram

 

2. Extend segment CB in the direction of B to E                        A line connects any two poins

 

3. Angle ABE = Angle DAB             A transversal cutting parallel lines form equal alternative ineterior angles

 

4. Angle CBE = 180                       Definition of a straight angle                           

 

5. m Angle CBA + m Angle ABE = m Angle CBE         Angle addition postulate

 

6.   m Angle CBA + m Angle ABE = 180                   Substitution    

 

7.  Angle CBA is spplemental to angle  ABE       Definition of supplemental angles

 

8. Angle DAB is supplemental to angle CBA       Substitution

 

9. Angle BCD = Angle DAB        Opposite angles in a parallelogram are congruent

 

10. Angle  BCD is supplemental to Angle CBA      Substitution

 

 

 

cool cool cool

 Jan 10, 2019
edited by CPhill  Jan 10, 2019

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