Supplementary adjacent angles form a "linear pair." Together, they make a line. The angle supplementary to 85° will be slightly obtuse, just as 85° is slightly acute.
18 ft* (1 piece/ 1 1/3 ft)= 13.5 pieces.
Mr. Gengel can only cut 13 pieces from the big board (because we don't have half a piece)~
I’m trying to figure this out too