So, if I try to form a parallelepiped with these three sides, and P is not in the plane, then it will have some volume.

所以如果我试着用这三边构成一个平行六面体，如果点P不在这个平面内，这个平行六面体就会有体积。

youdao

So, if I try to form a parallelepiped with these three sides, and P is not in the plane, then it will have some volume.

所以如果我试着用这三边构成一个平行六面体，如果点P不在这个平面内，这个平行六面体就会有体积。

youdao