The answer to this question would be: c) 4:1
In this question, the square is dilated by a factor of 2 to form A'B'C'D'. That mean the new square sides will be twice as much as the old square. The formula for area is side^2. Then, the area of the new square should be
a'=2a
old square area= a*a= a^2
new square area= a'*a'= 2a*2a= 4a^2
new square area:old square area = 4a^2:a^2= 4:1
