Home » Aptitude » Plane Geometry » Question
  1. Incentre of ∆ ABC is I. ∠ABC = 90° and ∠ACB = 70°. ∠AIC is
    1. 115°
    2. 100°
    3. 110°
    4. 105°
    5. None of these
Correct Option: E

As per the given in question , we draw a figure triangle ABC whose I is incentre ,

The point of intersection of internal bisectors of the angles of a triangle is incentre.
Given that , ∠ABC = 90° and ∠ACB = 70°
As we know that , ∠BAC + ∠ABC + ∠ACB = 180°
∠BAC = 180° – 90° – 70° = 20°

∴ ∠AIC = 180 -
∠A
-
∠C
22

∠AIC = 180° –10° – 35° = 135°



Your comments will be displayed only after manual approval.