So, we could describe a line by two equations telling us about the two planes that intersect on the line.
我们用两个方程来描述一条直线,两个方程告诉我们平面相交于直线。
If the point is within the polygon, the line will intersect the edges of the polygon an odd number of times.
如果该点位于多边形内,该线将与多边形的边相交奇数次。
So, see, the lines of intersections between two of the planes, so, here they all pass through the same line, and here, instead, they intersect in one line here, one line here, and one line there.
这个两平面相交得到的直线,两平面都经过同一条直线,此处,另外两平面交成直线,这一条,那一条。
All right, where the green and the pink line intersect.
没错,就是绿线和粉线的交点
Where the green and the pink line intersect.
在绿色与粉色线的交点处
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