Respuesta :

Answer:

1: DO = OB, AO = OC     1: Given

2: DOC = AOB                2: Vertical angles are equal.

3: Triangle COD congruent to Triangle AOB       3: SAS

4: 1 = 2, AB = DC            4: CPCTE

5: AB||DC                         5: If alternate interior angles =, then lines parallel.

6: ABABCD is a parallelogram               6: If two sides = and ||, then a parallelogram.


I just had this question on my lesson, the answers are right! Goodluck! :)