Geometry
posted by Anonymous .
What polygon is similar to every other polygon of the same name?
(A) triangle
(B) parallelogram
(C) rectangle
(D) square
(E) trapezoid

I'm not sure what you are asking. All have 4 sides, except a triangle. Otherwise, they are all similar. How similar do they have to be?

the square is the only choice which maintains its relative side lengths. All the others can be stretched in various ways and still retain their required attributes. The square must always have 4 right angles and 4 equal sides.