Question

What is always true about the angles of an isosceles triangle?

All three angles are congruent.
At least two of the angles are congruent.
The vertex angle is a right angle.
The vertex angle is obtuse.

Answer 1

Option 2 is correct.

Explanation:

We have to choose the statement which is always true about the angles of an isosceles triangle.

An isosceles triangle is a triangle that has two sides of equal length and has one vertex angle and two congruent base angles.

As opposite sides are equal

⇒ Two base angles are also equal by definition of isosceles triangle.

Hence, at least two of the angles of isosceles triangle are congruent.

Option 2 is correct.