## Geometry: Common Core (15th Edition)

$G$
An isosceles triangle has two sides that are of the same length. An equilateral has all congruent sides. The base angles of this isosceles triangle are congruent. Therefore, $\angle A$ is congruent to $\angle B$. However, we don't know anything about the measures of any of the angles. So we can only conclude that this triangle is an isosceles triangle. The answer is option $G$.