A:麦哲伦
B:张恒
C:魏格纳
D:哥伦布
如图,在已知的△ABC中,按以下步骤作图:
①分别以B,C为圆心,以大于12BC的长为半径作弧,两弧相交于两点M,N;
②作直线MN交AB于点D,连接CD.
若CD=AC,∠B=25°,则∠ACB的度数为( )
We will have to choose a person to __________ our class to take part in the competition.