Write the numbers in ascending prefer -10 , 2, -0.5 , 5/16

Hence, perimeter of ΔAEB is:

18.5 ft.

Step-by-step explanation:

The perimeter of ΔAEB is given as:

length of side AE+length of side BE+length of side AB.

As side AB║DF hence we will use Triangle Proportionality theorem to calculate the length of side AE.

Since,

Hence, we have:

Hence, perimeter of ΔAEB is:

6.5+4.2+7.8=18.5 ft.  

( since AE=6.5 ft

BE=7.8 ft

and AB=4.2 ft )

Hence, perimeter of ΔAEB is:

18.5 ft.