Answer:
It is 6
Step-by-step explanation:
By doing ratios, the ratio of XY to YZ is 9:12, which is 3:4. Since its congruent, due to the fact that they both have the same angle and both triangles have 2 sides which are congruent, we can safely say that these are congruent. Doing the same ratio, we get 6 for DE.
