- A81
- B99
- C180
- D90
Step-by-Step Solution
In an isosceles triangle the bisector of the apex angle is perpendicular to the base, so angle ADB = 90°.
Answer: D) 90
In triangle ABC, AB = AC and the bisector of angle A meets BC at D. Then angle ADB equals (in degrees):
Class 9Properties of Isosceles TrianglesGeometry — Triangles
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 Properties of Isosceles Triangles practice questions
More Class 9 Properties of Isosceles Triangles practice
If two sides of a triangle measure 7 cm and 7 cm, the triangle must be at least:In an isosceles triangle, the vertex angle is twice each base angle. The vertex angle is…Which of the following can be the three angles of an isosceles triangle?In isosceles triangle ABC, AB = AC, base BC = 16 cm and the altitude from A to BC is 6…In an isosceles triangle, an exterior angle at one base vertex is 110°. The vertex…