The longest leg of a 30-60-90 right triangle has a length of 18 feet. in simplest radical form, what is the length of the triangle's hypotenuse?

3√2
If the longest side is 18 then the hypotenuse is 18 because the hypotenuse is always the longest side. 
To find the simplest radical form you would do 9 root 2 and 2 root 2 which comes to 3 root 2

Maybe the answer is 20mm. all i really did was just multiply, which is obvious.