Find the area of a square with side a when a=2 in, a=12 in, and a=0.8 in. Are the area of a square and the length of its side directly proportional quantities? Why or why not?

Answer 1

surely you know that the area of a square of side a is just A=a^2
To be directly proportional, you must have area A
A = ka, for some constant k
but this is not true.