斜线在平面上的射影,直线和平面所成的角（The projection of a plane on a plane, the angle of a line and a plane）.docVIP

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斜线在平面上的射影,直线和平面所成的角（The projection of a plane on a plane, the angle of a line and a plane）.doc

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斜线在平面上的射影,直线和平面所成的角（The projection of a plane on a plane, the angle of a line and a plane）

斜线在平面上的射影,直线和平面所成的角（The projection of a plane on a plane, the angle of a line and a plane） Data worth having From the usual study, accumulation and summary Where there is a problem, there must be some Please also criticize and correct me! The projection of a diagonal line on a plane The angle of a line and plane I. quality education objective (1) knowledge teaching points Projection of 1. points on a plane The vertical line from point to plane 2. several concepts about the oblique line of a plane 3. some concepts of projective 4. projective theorem 5. some concepts of straight line and plane angulation (two) capacity training points 1., to deepen understanding of mathematical concepts 2., the initial society, based on the definition of the angle of line and plane, is used to solve the general method of angle problem Two, teaching key points, difficulties, doubts and Solutions 1. teaching emphasis: projective theorem and memory and the concept of angle between line and plane 2. teaching difficulties: the understanding of theorems and the practice of straight line and plane angles 3. teaching doubts and solutions: (1) the projection of diagonals on planes is the basis of the angles of the lines and planes; and there are more concepts in the subsection the projection of the diagonals in the plane For students to understand and memorize You can draw the graphics of the textbook while explaining the 1-30 sides Combining graphics memory Fast and accurate Generally draw a diagonal line, AC and plane alpha oblique to C Another AC a little A AB cited an alpha As the pedal point B Link BC It is then pointed out that AC is a slash on plane alpha; line AC is a diagonal line from point A to plane alpha The line segment AB is the vertical section of point A to plane alpha B is the point A to the vertical plane of the pedal alpha The line BC is the projection of line AC on plane alpha (2) the projection of a skew line on a plane is a line segment A projection of a diagonal line on