Question

find the perimeter of a rectangular playground whose area is 3600 m square and a length is 90 m

Answer 1

let the breadth be x

area of rectangle =length * breadth

3600=90*x

3600/90 =x

40 =x

then the breadth of rectangle is 40m

perimeter of rectangle is 2(l+b)

perimeter of rectangle =2(40+90)

here, perimeter of rectangle =2*130

here, perimeter of rectangle =260metre

hence your answer is 260 metre

i hope this will help you

Answer 2

Area of rectangle =length * breadth
3600=90*b
b =3600/90=40m.
Perimeter =2(l+b)
                 =2(90+40)
                  =2*130
                   =260 m