AB is a bamboo pole, AB= 1m, Bo =1.5m;
AB//CD//MN
CE=8, angle CED=30, CD⊥NO, so CD=4.
CD:AB=DO:BO,DO=4* 1.5/ 1=6
Ed. =EC? -CD? =64- 16=48
ED=4√3
NE= 19,
NO = NE+ED+DO = 19+4√3+6 = 25+4√3
MN:AB=NO:BO
MN = 1 *(25+4√3)/ 1.5 =(50+8√3)/3≈2 1.29(m)