- A128°
- B64°
- C52°
- D26°
Step-by-Step Solution
∠A + ∠B = 128° and the two angles are equal, so ∠A = 128° ÷ 2 = 64°. (52° is the interior angle at C.)
Answer: B) 64°
In the figure, ∠A = ∠B and the exterior angle ∠ACD = 128°. Find ∠A.
Class 9Exterior Angle of a TriangleGeometry — Lines and Angles
Master this chapter in 30 minutes a day.
Don't just memorise the answer — build a daily practice habit.
Practice 5 Similar Questions Free →All Exterior Angle of a Triangle practice questions
More Class 9 Exterior Angle of a Triangle practice
The interior angles of a triangle are 40°, 60° and 80°. Which is its largest exterior…In △XYZ, ∠X = 47° and side YZ is produced to W so that ∠XZW = 115°. Find ∠Y.An isosceles triangle has a vertex angle of 40°. What is the exterior angle at either…An exterior angle of a triangle is three times the interior angle next to it. Find the…Sneha says: “A triangle can have an exterior angle of 70° with an interior opposite…