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use fact the diagonal of a square is sqrt2 times side length
|dw:1375640019150:dw|

|dw:1375640072724:dw|

is that how i need to set it up?

Looks good to me. Do you know where to go from there?

eh not really well ....

I would use the pythagorean theorem to find the length of the sides. Does that help?

so x^2+x^2=20^2
x^2+x^2=400^@

Before taking the square root, divide both sides by 2.

\(x^2+x^2 = 20^2\)
\(2x^2=400\)

oh ok
\[\frac{ 2x^2 }{ 2 }=\frac{ 400 }{ 2 }\]
\[x^2=200\]
\[\sqrt{x^2}=\sqrt{200}\]

|dw:1375640872842:dw| what do i do from here

they want answer as decimal so no point in simplifying radical ...

haha:)

well if i needed the simple radical i was headed right :DD

\[\approx 14.14\]

\[\approx14\]

sorry i forgot that for a second

\(\approx14.1\)

oh well i got that all mixed up

You did well.

Your welcome.