Please help me in this right trapezoid semi circunference problem

[Majasaro]

AB=30m
ED=10m
EA=28m
BEC is a semi circunference, can you help me to find the area of ABCD, I'm like 1 year ago trying to solve this problem but I can't, I'm in Calculus 2 and Lineal Algebra but this problem I just can't find the solution

 

[Deleted member 4993]

View attachment 8564
AB=30m
ED=10m
EA=28m
BEC is a semi circumference, can you help me to find the area of ABCD, I'm like 1 year ago trying to solve this problem but I can't, I'm in Calculus 2 and Lineal Algebra but this problem I just can't find the solution

View attachment 8564
Assume AB intersects the semicircle F. Join CF. CFB is a right angled triangle and AF = CD. Does that give you a clue?

 

[Majasaro]

View attachment 8564
Assume AB intersects the semicircle F. Join CF. CFB is a right angled triangle and AF = CD. Does that give you a clue?

Nope, I Also tried to draw an parallel line to BC in D and do similar triangles but I can't find anything
also tried let D' belong to DC such that DC=D'C, then draw AD' and tried somes similar triangles but again, I didn't solve my problem, This problem it's driving me crazy, please show me how to solve This