# The length of the sides of the rectangle

A rectangle is a quadrilateral with all angles equal to 90 degrees.

**Find the side length of a rectangle by knowing the diagonal and the side**

**Diagonal of a rectangle d**

**Side of the rectangle a**

**Find the length of the side of a rectangle knowing the perimeter and side**

**Perimeter of a rectangle P**

**Side of the rectangle a**

**Find the side length of a rectangle knowing the area and side**

**Rectangle area S**

**Side of the rectangle a**