∵ 直角三角形中,斜边850.一角21度.
∴ sin21°=对边/斜边 ,
∴ 对边=斜边*sin21°=850*0.35836794954530027
=304.6127571135052295 .
∵ cos21°=邻边/斜边 ,
∴ 邻边=斜边*cos21°
=850*0.9335804264972017
=793.543362522621445 .
∵ 直角三角形中,斜边850.一角21度.
∴ sin21°=对边/斜边 ,
∴ 对边=斜边*sin21°=850*0.35836794954530027
=304.6127571135052295 .
∵ cos21°=邻边/斜边 ,
∴ 邻边=斜边*cos21°
=850*0.9335804264972017
=793.543362522621445 .