Squares are equilaterals (same length on every side) Rectangles could be called parallelograms but the parallel lines are the same. It's hard to explain but I could show you.
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Cubes have a square on each side, but rectangular prisms have rectangles or squares.
Yes. A Parallelogram is a quadrilateral that has two pairs of parallel sides which are opposite each other and of equal length, though the pairs may be of different length to each other. If the angles are all 90° then the parallelogram is also a rectangle. If the angles are all 90° AND all sides are equal then the parallelogram is also a square. All squares are rectangles, but not all rectangles are squares; Similarly all squares are rhombuses but not all rhombuses are squares And all rhombuses, and thus squares, are parallelograms, but not all parallelograms are rhombuses (nor squares).
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Rectangles have a right angle at each corner so all the angles are equal, but the lengths of the sides are not necessarily the same (although opposites must be or the corners will not be right angles). A square is a special kind of rectangle. All of the corners in a square are the same 90 degrees, like any old rectangle, but all of the sides of a square are also exactly the same length as each other. So all squares are rectangles, but not all rectangles are squares.
Rectangle.If all of the angles are equal to each other (360/4), each one is 90 degrees, or a right angle. If two pairs are equal to each other and each angle is 90 degrees, the shape is a rectangle. It could also be a square, a type of rectangle, if all of the sides are the same length. NOTE: All squares are rectangles, but not all rectangles are squares.