Question

21 what additional information is needed to prove that the triangles are congruent by asa? a d b c

Explanation:

Step1: Recall ASA congruence criterion

ASA (Angle - Side - Angle) requires two pairs of corresponding angles and the included side to be congruent.

Step2: Analyze given information

We need to identify what is missing to apply ASA. We likely have some angles and sides partially given, but we need the included - side between two known corresponding angles to be congruent. If we assume we know two pairs of corresponding angles, we need the side between those two angles in each triangle to be congruent.

Answer:

The lengths of the included sides between the two pairs of corresponding angles in the two triangles must be shown to be equal.