They both fall under the category of quadrilaterals. A square is a closed plane figure with four equal sides and four vertices forming four interior right angles. In contrast, a rectangle is a closed plane figure with four straight sides and four vertices forming four interior right angles.

We call a square a special type of rectangle because they both share some common properties which are listed below. A square and a rectangle have interior angles equal to 90°. The opposite sides in both shapes are equal and parallel. The diagonals that bisect each other are equal in length.

Quadrilaterals, or four-sided shapes, consist of both squares and rectangles. A square is a rectangle with four sides of equal length, while a rectangle has equal opposite sides, but not all four sides must be identical.

A square is a type of rectangle with all four sides of equal length. How do you prove that a rectangle is a square? To prove that a rectangle is a square, you need to show that all four sides are of equal length. To do this, take measurements from two opposite sides of the rectangle. If the measurements are equal, then the rectangle is a square.