Question

a rectangular field to be fenced on three side leaving a side of 20 cm uncoverd if the area of the field is 680m square how many metre of fencing is required

Answer 1

let the bredthbof rectangle be xcm
length of rectangle=20cm
area of rectangle,given=680m square
(1m =100cm,)
(1m square =100 cm square)
(680m square=680*100cm square =68000cmsquare)
according to question,
x cm *20 cm= 68000 cm
x *20=68000
x= 68000/20
x=3400cm
perimeter of recrangle=2(l+b)
=2(20+3400)
=2(3420)
=6840cm or 68.4m
=) 68.4m fencinng is required
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