In a ΔABC, if ∠A + ∠B + ∠C = 120°, then the value of ∠A is:
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 30°.
∠A + ∠B + ∠C = 180° ----- (1)
Given,
(1/2)∠A + ∠B + ∠C = 120° ----- (2)
Solving equation (1) and (2),
⇒ (1/2)∠A = 60°
⇒ (1/4)∠A = 30°