Given: 

Transversal






Find: 

Exercise 15, 16
To find:
The value of
The sum of angles that falls on the straight line is
Definition:
If there exists two parallel lines cut by a transversal then the pair of exterior angles on the same side of transversal is supplementary.
Given:
The given figure is,
The
Calculation:
Consider the given figure,
From the figure,
The value of
Consider,
Substitute
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