Which of these shapes has an area that is different from the rest?

The area of a circle is pi times the radius squared.

As pi will be in the area formula for all the shapes, this can be omitted (cancelled out). Thus, we have to find the circles with a different value for r^2.

A) =1,

B) =1,

D) =1,

However,

C) =1.125

Thus, the area of shape C is different.