what will be the 6th angle if the other 5 angles are 60,120,70,130,80?
angles of a 6-gon add to (6-2)*180 = 720
so, the missing angle is 720 - (60+120+70+130+80) = 260
Hmmm? That's an unusual angle, indicating a non-convex polygon. Is there something missing here?