He won the match because he took the advantage of his height.
A:played a joke on
B:made full use of
C:came up with
m=(1,sinA),n=(2,sinB),且m∥n.
(Ⅰ)求 b , c 的值;
(Ⅱ)求角A的大小及△ABC的面积.
如图,AC是电杆AB的一根拉线,测得BC=6米,∠ACB=52°,则拉线AC的长为( )