- AAcute-angled
- BEquilateral
- CObtuse-angled
- DRight-angled
Step-by-Step Solution
If the exterior angle is less than 90°, the interior angle next to it is more than 90°, so the triangle is obtuse-angled.
Answer: C) Obtuse-angled
One exterior angle of a triangle is acute. What type of triangle is it?
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
In the figure, ∠A = ∠B and the exterior angle ∠ACD = 128°. Find ∠A.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…