If patio is square it means that area of if is [tex]A=a^2[/tex] where a is one side
Now we can substitute A=200 and solve eq
[tex]a^2=200[/tex]
a=[tex] \sqrt{200} [/tex]
a=14.1421
Now we are rounding to the nearest tenths
a=14.1 because next number is 4 and is less then 5.
The result is 14.1