Choices: a no you cannot use hl to prove the triangles are congruent because there is no way to know if the hypotenuses of be and ec are congruent b no you cannot use hl to prove the triangles are congruent because there is no way to know if the legs of of ae and ed are congruent c yes you can use hl to prove the triangles are congruent. since you are given that e is the midpoint of ad and bc you know that the hypotenuses be and ec; as well as the legs ae and ed are congruent you can use hl to prove the triangles are congruent.