Formula Index

Perimeter of a rectangle & Calculator

The perimeter of a rectangle can be calculated using one of the following formula: if you know the length of one of the longest sides and one of the length of the shorter sides.

Formula Knowing one of the longest sides and one of the shorter sides

If you know the length of one of the longest and the shorter sides of the rectangle, you can calculate its perimeter using the following formula:

Rectangle Perimeter

$$"perimeter" = 2B + 2L$$

Rectangle Side Length

Perimeter result

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Where:

$$2 = "number of longest sides"$$
$$B = "one of the longest sides"$$
$$2 = "number of shorter sides"$$
$$S = "one of the shortest side"$$

Rectangle Definition

It is a geometric figure with 4 sides, all the sides have the same angle of 90º. All rectangles have two parallel sides with the same length.

All rectangles always will look the same , Despite this all have 4 sides and all this angles are 90º.

Perimeter Definition

A perimeter is defined by the outer path of a shape. The shape is always in 2 dimensions. The perimeter is the total length of the exterior path. Another way of looking at this is to think of it as the boundary length of a shape.

In the case of a circle, the perimeter is called a circumference.

Perimeter has a Greek origin, "peri" means "around", and "meter" means "measure". So perimeter means "measure around".

Formula Definition

It is a representation of a rule or a general principle using letters. (Algebra, A. Baldor)
When describing formulas in plural, it is also valid to say "formulae".


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