Question

what is always true about the angles of an isosceles triangle?
o all three angles are congruent.
o at least two of the angles are congruent.
o the vertex angle is a right angle.
o the vertex angle is obtuse.

Explanation:

An isosceles triangle has two equal - length sides. By the Isosceles Triangle Theorem, the angles opposite the equal sides are congruent. So, at least two of its angles are congruent. All three angles are congruent in an equilateral (a special case of isosceles), but not always. The vertex angle can be acute, right, or obtuse.

Answer:

At least two of the angles are congruent.