RRB NTPC · Question 96
What is the value of a? A. 65° B. 75° C. 105° D. 115°
Show answer & explanation
Answer: (D) D
Explanation
In the figure, angle a is an exterior angle of the triangle whose two interior opposite angles are 75° and 40°. An exterior angle of a triangle equals the sum of the two interior opposite angles, so a = 75° + 40° = 115°.