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

In an isosceles triangle, at least two of the angles are congruent. This is the defining property of isosceles triangles. Therefore, the correct statement is:

**At least two of the angles are congruent.**

The other statements are not always true for isosceles triangles. For example, the vertex angle is not necessarily a right angle or obtuse; it can be acute as well.