Page 179 - Touchpad Mathematics_Ver1.0_C4

E:\Working\Orange_Education\TouchPad_Maths_4\Open_Files\Chap_10\Chap_10
\ 10-Nov-2025 Bharat Arora Proof-8 Reader’s Sign _______________________ Date __________

 The length of the boundary of a closed figure is known as its perimeter.

 The perimeter is calculated by adding the lengths of all the sides of a polygon.
 The unit of the perimeter is the same as the unit of length of each side of the figure.
 The space enclosed within the boundary of a figure or shape is called its area.
 Area is measured in square units (sq. cm, sq. m, sq. km, etc.).

Learning LOGS

1. Find the lengths of the boundaries of the shapes drawn on geo dotted paper.

a. Colour the shape with the longest boundary in blue.
b. Colour the shape with the shortest boundary in green.

c. Tick the shapes that have the same boundary length.
2. Find the perimeter of the following figures.

5 cm 6 cm 6 cm 6 cm 9 cm 9 cm
a. b. c.

8 cm 6 cm 7 cm

4 cm 5 cm
10 cm
d. 2 cm 2 cm e. 4 cm 4 cm f. 5 cm 5 cm

10 cm
4 cm 5 cm

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Perimeter and Area