Page 151 - Math Skill - 4

11
Perimeter and Area
11 Perimeter and Area

Learning Outcomes

� Perimeter (Rectangle, Square) � Area (Rectangle, Square)

Boot-Up

Raju was measuring the length of his notepad with a 25 cm scale.
The notepad was 25 cm long and 15 cm wide. When he measured the other two sides,
he found, the same measurement.
What would be the length along the four sides of the notepad?

It would be 25 cm + 15 cm + 25 cm + 15 cm = ______ cm.
Find the total length of the boundary of the following figures.
4 cm 3 cm

(a) (b)
3 cm 3 cm 3 cm 3 cm

4 cm 3 cm

3 cm 2 cm
3 cm 6 cm
(c) (d)
1 cm

6 cm 2 cm
5 cm

Perimeter

The total length of the boundary of a figure is called its perimeter. The perimeter of a polygon
can be determined by adding the length of all its sides.

The concept of perimeter and its measurement is useful in day-to-day life. Let us learn the
concept of perimeter through examples.