Question

In order to prove that the two triangles are congruent by ASA, what must you know about the measure of ∠D?

Answer 1

To prove that two triangles are congruent by ASA (angle-side-angle) you must know that the measure of the included angle between the two known congruent sides is equal. So, you must know the measure of ∠D in both triangles, and it must be congruent.