Question : In a $\triangle A B C, \angle B+\angle C=110^{\circ}$, then find the measure of $\angle A$.
Option 1: 90°
Option 2: 70°
Option 3: 80°
Option 4: 60°
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Correct Answer: 70°
Solution :
In a $\triangle A B C, \angle B+\angle C=110^{\circ}$
The sum of angles in a triangle = 180°
⇒ $\angle A +\angle B+\angle C = 180°$
⇒ $\angle A + 110° = 180°$
⇒ $\angle A = 70°$
Hence, the correct answer is 70°.
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