Question

如图,为测量学校围墙外直立电线杆AB的高度,小亮在操场上点C处直立高3m的竹竿CD,然后退到点E处,此时恰好

Answer 1

（AB-EF）/(CD-EF)=(AC+CE)/CE;(AB-EF)/(C1D1-C1N)=(AC+CE+EC1+C1E1)/C1E1,C1D1=CD,C1N=EF,解得AB=15m