Given: 

Find: 

(See “Hint” in Exercise 26.) 
To find:
The value of
Given:
The given figure is,
Figure
And,
Concept:
If two lines are parallel lines are cut by a transversal then the angles of the alternate sides of transverse lines are equal.
Construction:
Draw a straight line passing through point
Figure
Calculation:
Consider the figure
Alternate angles are congruent
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