Answer:
SAS
Explanation:
To determine the congruence pattern, we need to identify the congruent sides and angles in the given triangles.
Given that C is the midpoint of segment AD and BE, we can infer that:
1. AC = CD (since C is the midpoint of AD)
2. BC = CE (since C is the midpoint of BE)
We also know that angle ACB is shared by both triangles, so ∠ACB = ∠BCD.
Therefore, we have:
1. Two sides are congruent (AC = CD and BC = CE)
2. The included angle between these sides is congruent (∠ACB = ∠BCD)
This matches the SAS (Side-Angle-Side) congruence pattern. So, you should use the SAS congruence pattern to show that the triangles are congruent.