They will never intersect nor be parallel.
Is this what you are asking? If they will always, sometimes, or never intersect?
To solve this you need to know Pythagorean theorem.
First, EG is 24, so the halfway points are 12. Knowing Pythagorean triples, you can use 5,12,13 and 12,16,20.
DF = 5+16
DF = 21
If you don't know Pythagorean triples, I have worked it out on the image attached.
Answer:
h=V/b
Step-by-step explanation: