Q. The two angles of a triangle are 75° and 65°. Twice the measure of its third angle is
(ADRE 2024)
(A) 40°
(B) 50°
(C) 60°
(D) 80°
Answer:- (D) 80°
Solution:-
Let the third angle be x.
We know that the sum of all angles in a triangle is 180°.
So, 75° + 65° + x = 180°
⇒ 140° + x = 180°
⇒ x = 180° – 140°
⇒ x = 40°
Twice the measure of the third angle is 2 × 40° = 80°.
Therefore, the answer is Option (D) 80°.