Review Exercises
Given: 




Prove: 

To Prove:
In the provided parallelogram
Theorem on parallel lines:
If two lines are cut by a transversal line and the alternate exterior angles are congruent, the lines are parallel.
Calculation:
It is given that
By the theorem on parallel line, two parallel lines DC and AB are cut by a transversal line AC (diagonal), alternate interior angles
Since ABCD is a parallelogram,
For
Here two sides and one angle are common to both the triangles.
Therefore, both are congruent triangles
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