ristkülikut
Ristkülik is a geometric shape. It is a quadrilateral, meaning it has four sides. The defining characteristic of a ristkülik is that all of its interior angles are right angles, measuring 90 degrees. Consequently, opposite sides of a ristkülik are parallel and equal in length. A ristkülik is a specific type of parallelogram, which is a quadrilateral with two pairs of parallel sides. The perimeter of a ristkülik is calculated by adding the lengths of all four sides, or by using the formula 2(length + width). The area of a ristkülik is found by multiplying its length by its width. Squares are a special case of ristkülikud where all four sides are of equal length. Ristkülikud are fundamental shapes encountered in many areas of mathematics, architecture, and everyday life, from the screen of a smartphone to the dimensions of a room. The diagonals of a ristkülik are equal in length and bisect each other.