直线与平面所成角是三种空间角之一.在掌握直接法的基础上,进一步学会转化法,将开拓思路,活化思维,增强能力. 一、直接法按定义,直接作出斜线在平面内的射影,则斜线与射影所成的锐角就是所求角.求解过程中,一般应遵循一定位,二定性,三定量的解题顺序. The angle formed by the straight line and the plane is one of the three spatial angles. On the basis of grasping the direct method, further learning the method of transformation will open up ideas, activate thinking, and enhance the ability. First, the direct method according to the definition, directly made oblique lines in the plane Within the projection, the acute angle formed by the oblique line and the projective angle is the desired angle. In the solving process, a positioning, two qualitative, three quantitative problem solving sequence should generally be followed.