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The projection point for learning "descriptive geometry" plays an important role in three-dimensional space point on the surface, alignment, and three-dimensional cross-sectional cut of point of intersection is the first projection. In this paper, cite specific examples of the peace line in the solu

Projection of the point for learning the descriptive geometry has a pivotal role, on spatial surface fixed-point, fixed line, stereo cutting and intersecting is to first find the projection of point. This article through specific examples of list for solving spatial line peace problem-prone place po

A projection regarding studies "Drawing technique Geometry" to have the pivotal function, on the spatial three-dimensional surface the fixed point, decides the line, the three-dimensional truncation cuts with passes through all strives for a first projection.This article enumerates the place through

The projection for the study of the CUK point geometry plays an important role of three-dimensional space, on the surface of the fixed point, there will be three-dimensional line, and stopped all and sang is Seek first point of projection. This article describes the adoption of specific examples in

Projection of the point for learning the descriptive geometry has a pivotal role, on spatial surface fixed-point, fixed line, stereo cutting and intersecting is to first find the projection of point. This article through specific examples of list for solving spatial line peace problem-prone place po