空间两直线平面角与其投影角变化关系的探讨

摘要

The angle between the two lines in space is often encountered in engineering practice.The diagram of random plane angle is not given in the engineering drawing teaching.In this paper , under the premise of a certain projection angle , it is analyzed detailedly change regulation between space plane angle and its projec -tion by application of three rays theorem.The purpose is to strengthen the teaching of engineering drawing and deepen the application of plane angle in engineering.%空间两直线的平面角是工程实际中经常碰到的问题，在工程制图的教学中，未能给出解决任意平面角的图解问题。本文应用三射线定理，在投影角度一定的前提下，详细地分析任意平面角与其投影角之间的变化规律，以期强化工程制图的教学工作，深化空间角度在工程实际中的应用。