Question

please solve this do only tick ones that are 2 ,4, 8, 12,

Answer 1

sol: 2nd one Ratio of length and breadth of a rectangular field=7:4
let the length and breadth of a rectangular field respectively =7x and 4x
perimeter =440 m
perimeter =2(l+b)
440 =2(7x+4x)
440 =2(11x)
440/2=11x
220=11x
11x=220
x=220/11
x=20

sol:4th one
diagonal of square =side. root 2
let the side of a square = x
x.root 2 = 12.root 2
x=12
side =12
perimeter = 4x 12 = 48

sol:12th one
circumference =2 pie r
radius = 21
=2x22/7x21
=132cm
Hope it helps :)
sorry don't know 8th one :)

Answer 2

8. 1st let us find the perimeter of square

perimeter of square = 4s = 4(20) = 80cm

80cm wire is made into a rectangle.

so perimeter of rectangle = 80cm

but we know that perimeter of rectangle = 2( length + breadth)

given length of rectangle = 24

perimeter of rectangle = 2(24 + breadth)

80 = 48 + 2 × breadth

breadth = 32/2 = 16cm