Please help me with the answer please ill give you 20 brainly and don't guess of the problem please

Answer:
D'E'=6cm
Step-by-step explanation:
By looking at the picture, it appears that the shape was dilated by a scale factor of 1/2, so, taking the length of DE, being 12cm, all we have to do is dilate that by 1/2.
DE=12cm
Dilated it by 1/2
D'E'=6cm