Comments

@PeacefulRespite, yes it is. Rectangle: a plane figure with 4 straight sides and 4 right angles. Squares are special types of rectangles (4 equal sides). It seems like dictionaries exclude squares as rectangles but most math resources don't. And since I didn't learn geometry from a dictionary... Squares are types of rectangles, squares are types of rhombuses, and squares, rhombuses, and rectangles are all parallelograms. Geometry, Bitch!!
All squares are rectangles, but not all rectangles are cats.