Perimeter

The perimeter of Rectangle for Class 5 Math

In mathematics, the perimeter of the rectangle refers to the total length of the rectangle’s edges. Here students will learn about the perimeter of the rectangle formula.

In this learning concept, the students will learn to

• classify the perimeter of a square.
• Identify the perimeter of the rectangle formula and the perimeter of the square formula. Also, the unit of the perimeter.
• Evaluate the perimeter of a polygon.

Each concept is explained to class 5 maths students using illustrations, examples, and mind maps. Students can assess their learning by solving the two printable worksheets given at the page’s end.

Download the perimeter of the rectangle worksheet for class 5 and check the solutions for the perimeter of the rectangle question provided in PDF format.

What Is Perimeter?

• The perimeter is defined as the total boundary length of the particular shape.
• Let us learn how to find the perimeter of rectangles and squares.

Perimeter of Rectangle

• A rectangle has two dimensions namely length and breadth.
• The formula to calculate the perimeter of the rectangle is
  Perimeter = 2 Length + 2 Breadth
• The unit of the perimeter is linear.

Example:

Find the area of the rectangle with a length of 22 cm and a breadth of 13 cm.

Solution:

Length of the rectangle = 22 cm

Breadth of the rectangle = 13 cm

Perimeter of the rectangle = 2 × 22 cm + 2 × 13 cm

               = 44 cm + 26 cm

               = 70 cm

Perimeter of Square

• All sides of the square are equal in length.
• The formula to calculate the perimeter of the square is Perimeter = 4 × Side

Find the perimeter of a square with a side of 19 cm.

Solution:

Side of the square = 19 cm

The perimeter of the square = 4 × 19 cm

                = 76 cm

Unit of Perimeter

• Perimeter is the sum of the boundary length of the shape.
• When the perimeter of the rectangle is calculated then it has to be made sure that the unit of the length and breadth are the same.
• When we add two same linear units, we get the linear unit.
• Therefore, the perimeter is always measured in the linear unit.
• For example, the perimeter of the rectangle with length and breadth of 15 m and 12 m is 54 m.

The perimeter of a Polygon:

Example:

Find the perimeter of the given figure.

Solution:

Perimeter = (5 + 2 + 2 + 2 + 4 + 2 + 6 + 9) cm

        = 32 cm

Missing Length

Example:

If the perimeter of the given figure is equal to 21 cm, then calculate the missing sides.

Solution:

Step 1:

Sum of the given sides = (4 + 6 + 2) cm

            = 12 cm

Step 2:

Perimeter = 21 cm

Missing Length = 21 cm – 12 cm

           = 9 cm

New words:

The perimeter of a circle is called the circumference.

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