If i have right angle triangle with a hypotenuse of 12meters and an angle of 60degrees what is the length

There are 2 basic trangles used in SAT,
45-45-90
30-60-90

if you look in the attachment you will know the relationship between each so

with a  30-60-90 triangle which you have
hypotonuse=2x
hypotonuse=12
2x=12
divide by 2
x=6

I'm not sure about the  length, but I'm assuming you mean the longer side

the measure of each leg is 6 and 6 times√3

the lonnger one is 6√3
the answer is 6√3 meters

Def is a scalene triangle