Which gives the area of rectangle with a width of 36cm and a perimeter of 80cm

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