Angle GHJ should be 60 degrees since angle FHJ is a straight angle. Angle FHE is also 60 degrees since GHJ and FHE are vertical angles. To calculate angle JHD use angle GHJ and DHE. Angle DHE is 90 degrees and GHJ is 60 degrees. Since angle JHF is a straight angle, 180-(90+60)=180-150=30. So, angle JHD is 30 degrees. You now have all the angles :3
