ristkülikuteks

Ristkülikuteks is a term that refers to rectangles in Estonian. A rectangle is a quadrilateral with four right angles. This means that all four interior angles of a rectangle measure 90 degrees. Opposite sides of a rectangle are parallel and equal in length.

Rectangles are fundamental geometric shapes with numerous applications in mathematics, architecture, design, and everyday life. The area of a rectangle is calculated by multiplying its length by its width. The perimeter of a rectangle is the sum of the lengths of all four sides, or twice the sum of its length and width.

Special cases of rectangles include squares, where all four sides are of equal length. Rectangles can be found in various objects such as doors, windows, books, screens, and building facades. Their simple yet regular structure makes them easy to work with in geometry and construction. The properties of rectangles are often used as a basis for understanding more complex shapes and their calculations.