Question 1105448
You already know it is special right triangle 30-60-90 type.  Hypotenuse is twice the size of the short leg.  If you know nothing else, then at least you know short leg is 3*sqrt(3).  Pythagorean Theorem will get you the long leg.


y, long leg
{{{y^2+(3sqrt(3))^2=(6*sqrt(3))^2}}}