Perimeter of a Rectangle

We will discuss here how to find the perimeter of a rectangle. We know perimeter of a rectangle is the total length (distance) of the boundary of a rectangle.

ABCD is a rectangle. We know that the opposite sides of a rectangle are equal.

AB = CD = 5 cm and BC = AD = 3 cm

So, the perimeter of the rectangle ABCD = AB + BC + CD + AD = 5 cm + 3 cm + 5 cm + 3 cm = 16 cm

Perimeter of a Rectangle

It can be written as 5 cm + 5 cm + 3 cm + 3 cm

                        = (2 × 5) cm + (2 × 3) cm

                        = 2 (5 + 3) cm

                        = 2 × 8 cm

                        = 16 cm

We add length and breadth twice to find the perimeter of a rectangle.

Perimeter of a rectangle = 2 (length + breadth)


Let us consider some of the examples on perimeter of a rectangle:

1. The length of a rectangle is 4 cm and its breadth is 2 cm. Find its perimeter.

Length = 4 cm

Breadth = 2 cm

Examples on Perimeter of a Rectangle

Therefore, perimeter of the rectangle

            = 2 (length + breadth)

            = 2 (4 + 2) cm

            = 2 × 6 cm

            = 12 cm


2. A rectangular swimming pool is 9 m long and 4 m broad. Find the area of the swimming pool.

Length of the rectangular swimming pool = 9 m

Breadth of the rectangular swimming pool = 4 m

Therefore, perimeter of the rectangle swimming pool

                                        = 2 (length + breadth)

                                        = 2 (9 + 4) m

                                        = 2 (13) m

                                        = 2 × 13 m

                                        = 26 m

Related Concepts

Units for Measuring Length

Measuring Instruments

To Measure the Length of a Line-segment

Perimeter of a Figure

Perimeter of a Triangle

Perimeter of a Rectangle

Perimeter of a Square

Unit of Mass or Weight

Examples on Unit of Mass or Weight

Units for The Measurement of Capacity

Examples on Measurement of Capacity

Measurement of Time

Read a Watch or a Clock

Antemeridian (a.m.) or Postmeridian (p.m.)

What Time it is?

Time in Hours and Minutes

24 Hour Clock

Units of Time

Examples Units of Time

Time Duration

Calendar

Reading and Interpreting a Calendar

Calendar Guides us to Know





4th Grade Math Activities

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