口算．×= += ﹣=×= ×0= ×=×2= 24×= ×=×=
过直线上一点画已知直线的垂线．
过B点画已知直线的垂线．
过O点分别画出AB、AC的垂线．
过点A作已知直线的垂线．
点P到两条直线的距离各是多少？请你画一画，量一量．
×
= 
+
= 
﹣
=
×
= 
×0= 
×
=
×2= 24×
= 
×
=
×
=
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