Concepts of perimeter:
FOR CLASS 4TH AND 5TH
DEFINATION: PERIMETER is the length of the boundary of a plane figure.
FORMULAS :
1) Perimeter of a given shape = the sum of the length of all sides of the given shape.
2)Perimeter of a rectangle = 2*(L+B)
3)Perimeter of a square = 4*S
4)Perimeter of an equilateral triangle = 3*S
BASIC SUMS BASED ON PERIMETER LEVEL -2
SESSION – 2
Q1 ]. Find the perimeter .
SOLUTION : 1st part
Given that :
Length = L = 6cm
Breadth = B = 4cm
Perimeter of rectangle = ?
Perimeter of rectangle = P = 2 * (L + B )
P = 2 * ( 6 + 4)
P = 2 * 10
P = 20 cm
SOLUTION : 2nd part
Given that :
Side = S = 3cm
Perimeter of the square = P = ?
Perimeter of the square = 4 * S = 4 * 3 = 12cm
SOLUTION : 3rd part
Given that :
Side = S = 500m
Perimeter of an equilateral triangle = P = 3 * S
P = 3 * 500 = 1500 m
SOLUTION : 4th part
Given that :
Side = S = 44.9cm
Perimeter of square = P = ?
P = 4 * S = 4 * 44.9 = 179.6cm
SOLUTION : 5th part
Given that :
Length = L = 22.5 cm
Breadth = B = 18.9 cm
Perimeter of rectangle = P = ?
Perimeter of rectangle = 2 * ( L + B )
P = 2 * ( 22.5 + 18.9 )
P = 2 * 41.1 = 82.8 cm
SOLUTION : 6th part
Given that :
Side = S = 14.5 cm
Perimeter of an equilateral triangle = P = ?
P = 3 * S = 3 * 14.5 = 43.5 cm
SOLUTION : 7th part
Given that :
Length = L = 400 m
Breadth = B = 200 m
Perimeter of rectangle = P = ?
P = 2 * ( L + B ) = 2 * ( 400 + 200 )
P = 2 * ( 600 ) = 1200 m
SOLUTION : 8th part
Given that :
Length = L = 162 cm
Breadth = B = 83 cm
Perimeter of rectangle = P = ?
P = 2 * ( L + B )
P = 2 * ( 162 + 83 ) = 2 * ( 245 ) = 490 cm