In Exercises 39 to 40, complete each proof.
Given:  Plane

Prove: 

To prove:
Approach:
If two parallel lines are cut by a transversal, then the two alternate interior angles formed are congruent.
Given:
The triangles
Figure
From figure
And,
Calculation:
Consider the triangles,
From the given data,
Since, the equal sides of the triangles are congruent
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