1. Sub. :- Mathematics Perimeter Std. :- 5 th Chapter no. 20

2. A perimeter is a path that surrounds an area. The word comes from the Greek peri (around) and meter (measure). The term may be used either for the path or its length - it can be thought of as the length of the outline of a shape. The perimeter of a circular area is called its circumference.area circumference In short Perimeter of a figure is the sum of the lengts of all sides of that figure

3. Perimeter of a Rectangle :- Formula 3 cm 1.5 cm P Q S R The Perimeter of a rectangle PQRS = Sum of lengts of all sides =3+1.5+3+1.5 = 3+3+1.5+1.5 =2 X length + 2 X breadth

4. The Perimeter of a rectangle = 2 X length + 2 X breadth Note :- If length & breadth of a rectangle are in Centimeters then unit of perimeter of a rectangle is cm If length & breadth of a rectangle are in Meters then unit of perimeter of a rectangle is m

5. The length of a rectangular playground is 120 m and its breadth is 75 m. Find its perimeter. Length of a rectangular playground = 120 m breadth of a rectangular playground =75 m The Perimeter of a rectangular playground = 2 X length + 2 X breadth = 2 X 120+ 2 X 75 = 240 +150 = 390 The Perimeter of the rectangular playground is 390 m.