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立体几何中解决角、距离、体积等问题时，常常要确定点到平面的射影的位置．本文谈一谈确定这一位置的常见方法．一、等度法命题１如果一个角所在平面外一点到角的两边距离相等，那么这一点在平面上的射影在这个角或其补角的平分线所在直线上．上命题是高中《立体几何》必...
When solving problems such as angle, distance, and volume in the three-dimensional geometry, it is often necessary to determine the point-to-plane projective position. This article talks about the common way to determine this position. First, the equal degree method Proposition 1 If a corner is located at a distance from both sides of the plane from the point to the corner, then the projection of this point on the plane is on the straight line of this angle or the bisector of its supplementary angle. The proposition is high school “solid geometry” must ...