Answer:
224 ft^2
Explanation:
We have the big square of 18 by 18 and we are taking away a square of 10 by 10
First find the area of the big square
A = 18*18 =324
Then find the area of the little square
A = 10*10 = 100
We take the big square and remove the little square
A 18 by 18 - A 10 by 10
324 - 100
224 ft^2