Answer:
72 square inches.
Step-by-step explanation:
Step 1:
First, you have to set up an equation:
Perimeter: 2x + 2x + x + x = 36
Step 2:
Then, you have to find out what x is. To find out faster, simplify the equation by combining like terms:
2x + 2x + x + x = 6x
Step 3:
Next, find x:
6x = 36
36/6 = 6
Step 4:
Finally, find the value that is twice as big as 6 and then multiply the two numbers together.
6*2 = 12
12*6 = 72
