Rectangle

A rectangle is a quadrilateral whose interior angles are all right angles. It is a special case of the parallelogram and therefore also of the trapezium. A special case of the rectangle is the square, in which all sides are the same length.

Properties

• It has four sides and four corners
• The interior angles are right angles
• The opposite sides run parallel and are the same length
• Both diagonals have the same length
• It has a perimeter and is therefore a chord quadrilateral. The center of the circle is the intersection of the diagonals

Formulas for the rectangle

Area

Perimeter

Diagonal

Circumference radius

Golden rectangle

Golden rectangles are called rectangles with the aspect ratio \(\displaystyle \frac{a+b}{a}=\frac{a}{b}\)

The aspect ratio is the golden ratio\(\displaystyle \frac{a}{b}=\frac{1+\sqrt{5}}{2}≈1.6180339887\)

Rectangle online calculator →