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Hello!

The formula for area is l * w. So, just multiply 12 by 9.. 12 * 9 = 108.

Hope this helps! ☺♥
jyoung551780
So here is your rectangle.
___12ft____
|_________| 9ft

All you have to do is multiply the two numbers. 
12 x 9 = 108
Your final answer is 108ft².
I hope this helps love! :)