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NCERT 5th Class (CBSE) Mathematics: Area And Volume

This stamp has been stuck on centimeter-squared paper. Take each square to have a side of 1 cm.

Centimetres-squared paper-1
Perimeter is the distance around the edge of a figure.
If an ant walks around the sides of the stamp it would need to walk 4 + 3 + 4 + 3 = 14 cm.
So, the perimeter of the stamp is 14 cm.
Perimeter = 2 × (l + b)
Centimetres-squared paper-2
Centimetres-squared paper-3
Area is the amount of surface a figure  covers.
Glue would have been applied to 12 squares in order to stick the stamp.
We can say that the stamp covers an area of 12 square centimeters or 12 sq. cm.
Centimetres-squared paper-4
Centimetres-squared paper-5
You can count half squares and add them to make full squares while finding the are of shapes like this. 9 full squares, 8 half squares = 4 full squares, 9 + 13, Area = 13 sq. cm
Centimetres-squared paper-6
Centimetres-squared paper-7
This is the image of a thumbprint. It does not have a regular shape. We have to estimate the area of shapes like this. Complete squares = 5, Incomplete squares combining to make complete squares = about 5 squares, 5 + 5 = 10 squares, Area of thumbprint = about 10 sq. cm
Centimetres-squared paper-8

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