Page 165 - Maths Class 04

Objective : To find the perimeter of a rectangle

Materials Required : A coloured chart paper, a carboard, a glue-stick, thread,
drawing pins, a ruler, a pencil, an eraser and a pair of scissors.

Preparation : Students will work in pairs.

Steps :

1. Draw a rectangle ABCD of any dimensions on the coloured chart paper.
2. Cut it out from the chart paper and paste it on the cardboard.

3. Put pins A, B, C, D at the corners.
4. Now, take a thread and turn it tightly around the drawing pins A, B, C and D

till it comes back to the starting point.

A B

C D

5. At this point A, cut off both the ends of the thread. Now, remove the thread

from the rectangle and measure its length using a ruler. This will give you the
perimeter of the rectangle.

6. So, you will get the length of the thread = perimeter of ABCD which will be

equal to AB + BC + CD + DA.

Record of the Activity :

Perimeter of the rectangle = cm.

Mathematics-4 165