Q109
∠A + 1/2 ∠B + ∠C = 140°, then ∠B is :
∠A + ∠B + ∠C = 140°, then ∠B is :
A.
50°
B.
80°
AnswerC.
40°
D.
60°
Answer: Option B
Solution
Answer: Option B
Solution:
According to question,∠A + ∠B + ∠C = 140° . . . . . . . . (i)
As we know that
∠A + ∠B + ∠C = 180° . . . . . . . . . (ii)
Compare equation (i) and (ii)
∠B = 40°
∴ ∠B = 80°