The answer would be: 88inches
Use this formula
A=16
B=6
H=8
To solve this you need to take the both bases (6 and 16) and add them together.
16+6=22
Now divide 22 by 2 and you end up with 11.
Then you multiply 11 and 8.
11*8=88
Now you are left with your answer: 88inches
Hope this helps! :3