Question 318499
length of rectangle= x
widthof rectangle  =y
area = xy =100
..
diagonal = sqrt(x^2+y^2)
side of square = Sqrt(x^2+y^2)
Area =sqrt(x^2+y^2)*sqrt(x^2+y^2)
x^2+y^2=700
add 2xy to both sides
x^2+2xy+y^2=700+2xy
(x+y)^2=700+2xy
(x+y)^2=700+200
(x+y)^2=900
x+y=30
Perimeter = 2(x+y)
perimeter = 2*30=60 sq.cm