Triangle D E F is cut by line segment A B. Line segment A B goes from side D E to side F E. Lines D F and A B are parallel. The length of A B is 4. 2 feet, the length of D A is 2 feet, the length of F B is 2. 4 feet, and the length of B E is 7. 8 feet. What is the perimeter of TriangleAEB? 16. 4 ft 18. 5 ft 18. 7 ft 22. 9 ft.