Q107
Incentre of ΔABC is I. ∠ABC = 90° and ∠ACB = 70°. Then ∠BIC is
A.
115°
B.
100°
AnswerC.
110°
D.
105°
Answer: Option B
Solution
Answer: Option B
Solution:
∵ Sum of all angles of a triangle = 180°So, ∠BAC = 180° - (90° + 70°) = 20°

So, ∠BIC = 90° + ∠A
∠BIC = 90° + × 20°
∠BIC = 100°