Perimeter

Perimeter

By,

Hrishikesh Sahu

Perimeter

Perimeter is defined as the length of the boundary of any shape.

To find the perimeter, we just add the lengths of the sides along the boundary.

Example 1: The measurments of a swimming pool are given below. Pooja walked along the sides of the pool. How much distance has she walked ?

Measurements: all the lenghts=50m all the breadth=20m

Solution:

Distance walked by Pooja=Perimeter of the pool

=50m+20m+50m+20m=140m

Pooja walked 140m along the sides of the pool.

Perimeter of Simple Polygons

For polygons too, perimeter is the total length of all the sides.

Example 1: Find the perimeter of the given polygons.

a.Rectangle: All lengths=8cm All beadths=4cm b. Triangle: all sides=5cm

Solution:

a. The perimeter of the rectangle =8cm + 4cm + 8cm + 4cm

= 24cm

b. The perimeter of the triangle =5cm + 5cm + 5cm

= 5cm x 3 = 15cm

Perimeter of a Rectangle

In a rectangle, the opposite sides are equal. The length of the rectangle is shown as L and the breadth as shown as B. The perimeter of the rectangle = L + B + L + B, which two times the sum of L + B = 2 x ( L + B ).

Perimeter of a Squares

In a square, all sides are equal. The length of the sides of a square is represent as S. The perimeter of a square = S + S + S + S = 4 x s.

Examples

Example 1: Find the perimeter of a rectangle whose length is 4cm and breadth is 11cm.

Solution:

Perimeter of a rectangle = 2 x ( L + B )

= 2 x ( 4cm + 11cm )

= 2 x 15cm = 30cm

Example 2: Find the perimeter of a square whose side is 7cm.

Solution:

Perimeter of a square = 4 x s

= 4 x 7cm = 28cm

Multiple Choice

Find the perimeter of a Square whose side is 10cm.

• 25cm

• 10cm

• 40cm

• 65cm

Multiple Choice

Find the perimeter of a rectangle whose length is 5cm and breadth is 15cm.

• 20cm

• 30cm

• 100cm

• 40cm

Multiple Choice

Find the perimeter of a triangle whose sides are 3cm.

• 9cm

• 5cm

• 6cm

• 12cm

Multiple Choice

Find the perimeter of s square whose sides are 4cm.

• 16cm

• 20cm

• 45cm

• 32cm

Multiple Choice

Find the perimeter of a diamond whose sides are 5cm.

• 10cm

• 20cm

• 5cm

• 15cm

Multiple Choice

Find the perimeter of a rectangle with length of 12cm and breadth of 6cm

• 36cm

• 60cm

• 96cm

• 300cm

Multiple Choice

Find the perimeter of a square with side of 15cm.

• 10cm

• 30cm

• 60cm

• 100cm

THE END

THANK YOU EVERYONE TO JOIN WITH ME.

MY NAME,

HRISHIKESH SAHU