Does anyone know how I can dimension 2 lines that are over 180*?

CLICK DIMENSION.
SELECT YOUR LINES AND FORM YOUR DIM.
THEN LEFT CLICK WHILE STILL IN THE DIM COMMAND.
SELECT OPTIONS.
SELECT OPPOSITE ANGLE...SORRY FOR 'YELLING' LOL friggin caps lock
 

THANKS!!!!  tHAT WORKED!!!

No problem man, dont be a stranger to the site!!