Hold on it might take me a few
The perimeter of the larger Pentagon is 35in. You do 7 times the number of sides (7×5), because all the sides are congruent, which should equal 35.
2a+13a+30
15a+30
That would be your answer. Hope this helped!
-TTL
The volume would be 108 feet
The formula to find the volume is
(length)(width)(height)/3
in your equation's terms it would look like (6)(6)(9)/3
