点与两平面的位置关系的判别条件

Discriminating Requirements for the Location Relationship between Point and two Planes

主要讨论不在平面π1和π2 上的点M与两平面π1和π2 的位置关系的判别条件 :若π1与π2 平行 ,点M是否在π1与π2 之间 ;若π1与π2 相交但不垂直 ,点M是在由π1与π2 所构成的锐角二平面内 。

The present article mainly discusses discriminating requirements for the location relationship between the point M which does not appear on planes π 1 and π 2 and that of themselves:supposed π 1 keeps parallel with π 2,then when is the case that M wxists between π 1 and π 2? And if π 1 intersects with π 2 but not in a vertical state,should M appears in an acute plane angle or in an obstuse plane angle constructed by the two planes π 1 and π 2 ?