Rectangle perimeter

Perimeter is the distance around a two-dimensional shape.

Rectangle — is a quadrangle in which all angles are straight (equal to 90 degrees). In Euclidean geometry, for a quadrilateral to be a rectangle, it is enough that at least three of its angles are straight, then the fourth angle, by the theorem on the sum of the angles of a polygon, will also be 90 °.

The perimeter of a rectangle is the sum of the length and width multiplied by “2”. where "a" is the length of the rectangle, "b" is the width of the rectangle. The sides of the rectangle, which lie opposite each other, we call the length and width.