Answer:
I believe the answer is ten.
Step-by-step explanation:
the line to CA is the same length as AE so you would double it to get ten for CD.
hope this helps!
First you need to solve for angle F then you can use 1/2acSinB. If you haven't done this you can also use the Pythagoras theorem and solve for the unknown side once you do that you can just use 1/2 b*h