Area of a rectangle
Area A = w x h

AB = DC = width = w
AD = BC = h = height

Example

ABCD is a rectangle of width w = 8 cm and of height h = 4 cm
Area A of the rectangle = w x h = 8 x 4 = 32 cm²

Calculate the area of a rectangle

Width
Height
Area of the rectangle

Definition of a rectangle

A rectangle is a quadrilateral which has its 4 right angles.
A rectangle is a type of quadrilateral that has its parallel sides equal to each other and all the four vertices are equal to 90 degrees.
A rectangle is a four-sided shape whose corners are all ninety degree angles.

Properties of a rectangle

A rectangle has its diagonals of the same length which intersect in their middle. The diagonals are parallel to each other and have the same length.
Each interior angle is equal to 90 degrees. The sum of all the interior angles is equal to 360 degrees.
A rectangle is a parallelogram with four right angles.
A rectangle is a quadrilateral.
The diagonals bisect each other.
A rectangle has its opposite sides 2 to 2 parallel and of the same measure.
When two diagonals bisect each other at 90°, it is called a square.
Since the sides of a rectangle are parallel, it is also called a parallelogram.
The diagonals of a rectangle are congruent. If the diagonals of a quadrilateral are congruent, then this quadrilateral is a rectangle.

To go further

A rectangle is a parallelogram. Indeed its sides are parallel.
A rectangle is a trapezoid. Indeed a trapezoid is a quadrilateral of which two sides are parallel.

The area of a rectangle is the product of its length and width.
The area of a rectangle is found by multiplying the length by the width.

Is a square a rectangle?

A square is a rectangle. Indeed a square is a rectangle because it possesses all the properties of a rectangle.
A square is a special type of rectangle because it possesses all the properties of a rectangle.
All squares are rectangles, but not all rectangles are squares.