What is Rectangle?
A rectangle is a 2D shape in geometry, having 4 sides and 4 corners. Its two sides meet at right angles. Thus, a rectangle has 4 angles, each measuring 90 ̊. The opposite sides of a rectangle have the same lengths and are parallel. Two sides are said to be parallel, when the distance between them remains the same at all points.
Other names of the rectangle

Since all the angles of a rectangle are equal, we also call it an equiangular quadrilateral.

Since it has parallel sides, we can also call it a parallelogram. A parallelogram is a quadrilateral whose opposite sides are equal and parallel.
Equiangular Quadrilateral
Parallelogram
Properties of a rectangle:

It is a flat shape

It has 4 sides (edges)

It has 4 corners (vertices)

It has 4 right angles
Area of a rectangle:
The area of a rectangle is the product of its two adjacent sides
Area of a rectangle = Length × Width
Perimeter:
The perimeter of a rectangle is the sum of the length of its four sides. Since parallel sides of a rectangle have the same length, the formula for the perimeter of a rectangle is
Perimeter of a rectangle = Length + Width + Length + Width
= 2 length + 2Width
= 2 (length + Width)
Diagonals of a rectangle:
The line segments that join the opposite corners of a rectangle are called its diagonals. In the given figure, the two diagonals of the rectangle are AC and BD. The diagonals of a rectangle are the same in length. Therefore, AC = BD
Rectangle being the most common shape forms a part of our day to day life. Some reallife examples of the rectangle are table tops, books, mobile phones, TV, etc.
Fun Facts
