Make a box thats 32x20
32x20=640 square ft for box 1
For box 2 ||
40-32= 8
16x8= 128 square ft for box 2
For triangle 3
20-16=4
Has dimensions of 8x4|| divide by two to the t the area of a triangle
(8x4)/2 = 16 square fr
16+128+640= 784 square ft total