请你协助兴趣小组同学,按下列分类表解逐一分类.
____
如图所示,梯子AB靠在墙上,梯子的底端A到墙根O的距离为2m,梯子顶端B到地面距离为7m,现将梯子的底端A向外移动到A’,使梯子的底端A’到墙根O的距离等于3m,同时梯子的顶端B下降至B’,那么BB’的长为
如图,在平行四边形ABCD中,AD=5cm,AP=8cm,AP平分∠DAB,交DC于点P,过点B作BE⊥AD于点E,BE交AP于点F,则tan∠BFP=____ .
—Niagara Falls would be beautiful, but there is not much to do there.
fàn làn
shuāi jiāo
fēi xiáng
jì mò
mi shi
chà yì