180°-(48°39′40〃)-(37°41′35〃)
=179°59′60〃-[(48°39′40〃)+(37°41′35〃)]
=179°59′60〃-[85°80′75〃]
=179°59′60〃-[86°21′15〃]
=93°38′45〃
180°-(48°39′40〃)-(37°41′35〃)
=179°59′60〃-[(48°39′40〃)+(37°41′35〃)]
=179°59′60〃-[85°80′75〃]
=179°59′60〃-[86°21′15〃]
=93°38′45〃