180°-(49°38′+66°22′)
=180°-(49°+66°+38′+22′)
=180°-(115°+60′)
=180°-116°
=64°
19°43′26″×5
=(19°+43′+26″)×5
=19°×5+43′×5+26″×5
=95°+215′+130″
=95°+180′+35′+120″+10″
=95°+3°+35′+2′+10″
=98°+37′+10″
=98°37′10″