Question

Find the side of a square whose diagonal is of the given measure. Given = 8 miles

Answer 1

diagonal: d=a√2(a is the side)
8=a√2
a=4√2miles

Answer 2

To work this out you need to use the hypotenuse,

$a^{2} + b^{2} = 8^{2}$,
Or simplify to:
$2 * a^{2} = 64$

Which can be halved:
$a^{2} = 32$
Which the root of 32 is 5.7.
So the answer is 5.7 miles.

Hope this helps.