All you need to do to find the perimeter of an irregular shape is to know all the measurements of the shape and add them all together.
Answer:
it's 5 because 20 -15 is 5
You have to work out the area of each side. The two identical triangles are 6x4=24 because 8/2 is 4. The base is 8x5=40. The back is 6x5=30 and the top is 10x5=50. You then add them all together to get 144 ft squared.
add 6a and 5a and get 11a
then:
11a=-11
a=-1
Hey I think the answer is letter b if not
I am sorry
