First of all we need to know that we are going to calculate the area of two squares:
The firstone:
[tex]area=12\cdot15=180ft^2[/tex]The secondone:
[tex]\text{area}1=18\cdot22=396ft^2[/tex]the diference was:
[tex]396-180=216ft^2[/tex]Finally, the answer is 216 square ft have increased.
