Mathematics Related to the Rectangle Sketch
You may already know that three sides (SSS) is enough to determine the shape of a triangle. However, in general, four sides are not enough to determine the shape of a quadrilateral. For example, you can draw two different types of quadrilaterals with side lengths 3cm, 3cm, 5cm, and 5cm. One type would be kites and the other parallelograms. Because the angle measures of these kites and parallelograms are not fixed, you can create infinitely many of them. For example, you could have two kites, each with sides of 3cm, 3cm, 5cm, and 5cm, but one with angle measures of 90, 110, 110, and 50 degrees, and the other with angle measures of 120, 89, 89, and 64 degrees. Because the angles are fixed in a rectangle (each angle must be 90 degrees), however, two adjacent sides are enough to determine the shape.