Question

the area of square is 450 square CM the length of a diagonal is

Answer 1

area=450 cm square
area of a square= s*s
                          root 450=s
                           s=21.21cm(approx)
for finding the diagonal, we use
2s square = diagonal
2*21.21=diagonal
diagonal=42.42cm approx
thnks for asking hope u are satisfied with my answer

Answer 2

let the side be x 

now,

as we know that the area of square = side^2 

here, 

area of the given square = 450

side^2 = x^2 = 450

x^2= 450

x= root 450


as we know that all sides of square are equal, now by pythagoras theorem,

side^2 +side^2  = diagonal^2

x^2 + x^2 = diagonal^2

2x^2 = diagonal^2

2(450)^2  = diagonal^2

450 root 2 = diagonal^2

OR 


636.4 cm  = diagonal


i hope this will help you 


-by ABHAY