Given: 


Prove: 

To prove:
Given:
Properties:
The sum of the three angles in a triangle is
Angle bisector bisects the angle in half.
Definition:
If two parallel lines are cut by a transversal, then the angles on the transversal side are called supplementary and the sum of the measures of the angles is
Calculation:
Consider the given figure.
Figure
Calculate the sum of the angles of the given triangle.
Since, the angle bisector bisect the angles in the half, then
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