Question

I just don't get this in general

Answer 1

mj will be 60 dagree for the others use the hypatos  formula 

Answer 2

I hope this helps you



in 30-60-90 triangle



30 => k=HJ


60=> k square root of 3=HI


90=> 2k=JI


2k=12 square root of 23


HJ=k=6 square root of 23


HI=k square root of 3=6 square root of 69


m (J)=60