Question
Find the measure of $\angle\text{A}$ In Figure. 
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Answer
As we know, the measure of exterior angle is equal to the sum of opposite interior angles. $\therefore \ 115^{\circ}=65^{\circ}+\angle\text{A}$ $\Rightarrow \ \angle\text{A}=115^{\circ}-65^{\circ}=50^{\circ}$
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