Answer:
By SAS rule
Explanation:
Required to Prove
ABC is congruent to DEC
Given
C is midpoint of AD and BE
As C is the midpoint of both line segments
AC=CD
BC=CE
and ∠ACB=∠DCE(Vertically opposite angles)
⇒By SAS(side-AC and DC, angle-∠ACB,∠DCE,side-BC and EC) congruency rule
triangle ABC is congruent to triangle DEC