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A day full of math games & activities. Find one near you.

# What is the formula of a rectangle?

**Solution:**

A rectangle is a closed two-dimensional figure in which the opposite sides are equal and all the angles are equal to 90 degrees.

The following are the main formulas used to calculate the dimensions related to a rectangle:

- The formula for the diagonal of a rectangle is derived using the Pythagoras theorem. Diagonal of Rectangle (d) = √(l² + w²); where 'l' is the length and 'w' is the width of the rectangle.
- The area of a rectangle is the number of unit squares that can fit into it. Area of a Rectangle = (Length × Width)
- The perimeter of a rectangle is the length of its outer boundary. Perimeter of a Rectangle Formula = 2 (Length + Width)

Thus, we use the given formulas to calculate the required dimensions of a rectangle.

## What is the formula of a rectangle?

**Summary:**

The formulas of a rectangle are based on its basic properties which state that it is a quadrilateral in which the opposite sides are equal and parallel and all the interior angles are equal to 90 degrees.

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