Question

The area of a rectangle is 18 , and its diagonal is sqrt(85) . Find its dimensions and perimeter.

Answer 1

let
length=x
width=y
xy=18
x^2+y^2=sqrt(85)
2(x+y)=?
x,y=?
(x+y)^2=x^2+y^2+2xy
=sqrt(85)+18
=27.22
(x+y)=5.2
solve this to get ur result

Answer 2

im sorry im still not following

Answer 3

i understand xy=18 and x^2 + y^2=sqrt(85) but where did the 2(x+y) and the rest come from?

Answer 4

2(x+y) is perimeter

Answer 5

x,y are dimensions

Answer 6

(x+y)^2=x^2+y^2+2xy is an identity

Answer 7

put values in this identity and find the unknowns