To find the area of a rectangle you would do this:
Width x Length
We would have to find the length of the rectangle before we find the area
36 (2) + 2 (L) = 80
Since there are two widths and 2 lengths I would do it like this
72 + 2 (L) = 80
Subtract
2 (L) = 8
Divide
Length = 4
Now we can do the area like so:
Width times length
36 times 4 = 144
144 cm^2 = area
