a=247.56 ; b=213.5+18+12; c=283.42;
B=acos((a*a+c*c-b*b)/(2*a*c));
RB=B*(180/pi)
C=acos((a*a+b*b-c*c)/(2*a*b));
RC=C*(180/pi)
D=atan2(234.5,366.88);
RD=D*(180/pi)
E=RD+RB+RC-180
F=RD+RB