Page 136 - ICSE Math 4

ACTIVITY

What To Do?

To calculate perimeter and area of squares and rectangles using a geoboard

What We Need?

Geoboard, rubber bands, a paper and a pencil
How To Do? 1 unit
 Place rubber bands around

the nails to form squares and Geoboard
rectangles of diff erent lengths.
 Remember that the length of
the line connecting two nails on
the geoboard is equal to 1 unit
small square
and the area of one small square
is equal to 1 square unit.

 Form squares and rectangles of diff erent
lengths as shown.
 Calculate the perimeter by adding the

lengths of all the sides of the shape formed. Rectangle
 Calculate the area of the respective shape by
counting the number of squares it can cover.

Perimeter of rectangle = 4 + 2 + 4 + 2 = 12 units
Area covered by rectangle = 8 square units Square

Perimeter of square = 2 + 2 + 2 + 2 = 8 units
Area covered by square = 4 square units
 Repeat forming more squares and rectangles of diff erent lengths and fi nding
their perimeter and area.

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