Question 668543
If we have a 30,60,90 triangle where a,b,c are the lengths from smallest to largest then we have that 

a = a
b = sqrt(3)*a
c = 2a

So c = 6 * sqrt(3),  a is half of that giving us 3*sqrt(3), and b is 3*sqrt(3)*sqrt(3) = 3 * 3 = 9

a = 3*sqrt(3)
b = 9
c = 6*sqrt(3)