1. The problem statement, all variables and given/known data

See Figure

2. Relevant equations

3. The attempt at a solution

See Figure

I'm fairly certain the force I drew at point D isn't at a 90 degree angle, but if its not I can't find the perpendicular distance for the horizontal/vertical distances at the point D.

This has been giving me a really big headache and alot of stress lately so some help would be greatly appreciated!