Question

if a triangle is isosceles, then the base angles are...
obtuse
congruent
not congruent
rewatch skip

Explanation:

An isosceles triangle has two equal sides, and the angles opposite these equal sides (the base angles) are equal, meaning they are congruent. The diagram also confirms this with the theorem: if $\overline{AB} \cong \overline{AC}$, then $\angle B \cong \angle C$.

Answer:

congruent