Work Step by Step
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 $G$.