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Learn the characteristics of a rectangle , such as opposite sides equal and parallel, interior angles 90°, and diagonals bisect each other. Find the formulas for area, perimeter, and diagonal of a rectangle , and see the types of rectangles like square and golden rectangle . A rectangle is one of the most common geometric shapes in mathematics. It is widely used in geometry, architecture, engineering, and everyday life. In this guide, you will learn the definition, properties, formulas, proofs, and examples of a rectangle . We will also explore the differences between a rectangle and a square, along with practical applications. A Rectangle is a four sided-polygon, having all the internal angles equal to 90 degrees. The two sides at each corner or vertex, meet at right angles. The opposite sides of the rectangle are equal in length which makes it different from a square. Learn the definition, formula and examples of rectangle properties , such as opposite sides parallel and equal, diagonals equal and bisecting, and area and perimeter formulas. Also, find out how to identify a square and a cylinder from a rectangle .