NEW ENGLISH SCHOOL HINGANGAON th Std 6 Sub
NEW ENGLISH SCHOOL, HINGANGAON th Std. : - 6 Sub. : - Mathematics Perimeter
�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. �In short Perimeter of a figure is the sum of the lengths of all sides of that figure
Perimeter of a Rectangle : - Formula P 3 cm S 1. 5 cm R Q �The Perimeter of a rectangle PQRS = Sum of lengths of all sides =3+1. 5+3+1. 5 = 3+3+1. 5 =2 X length + 2 X breadth
The Perimeter of a rectangle = 2 X length + 2 X breadth The Perimeter of a rectangle = 2 (l+b) 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
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.
Perimeter of a Square Formula �Perimeter of a Square = 4 X length � =4 X l �Example: Find the perimeter 0 f square whose side is 12 cm. �Solution: Perimeter of a Square = 4 X lengths =4 X l =4 X 12 =48 cm
Perimeter of a triangle : - Formula Perimeter of a triangle =a+b+c a b c
Example Find the perimeter of triangle whose sides are 10 cm, 12 cm, 14 cm. solution: Given : sides of triangle : a=10 cm b=12 cm c=14 cm �Perimeter of a triangle =a+b+c = 10+12+14 =36 cm
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