71与三角形有关的线段（71 a line segment related to a triangle）.docVIP

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71与三角形有关的线段（71 a line segment related to a triangle）.doc

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71与三角形有关的线段（71 a line segment related to a triangle）

71与三角形有关的线段（71 a line segment related to a triangle） 71 and the triangle are on the line.Txt The seventh chapter triangle 7.1 and the triangle line Learning method guidance The 1. triangle is one of the most common geometry, has been widely used in industrial and agricultural production and daily life. According to the review of triangle edge and angle according to the classification. This section should learn knowledge 2. the study contents of this section, to pay attention to between students between teachers and students, communication. Through discussion, midline and angle bisector to exchange the triangle, and the relationship between the three sides of a triangle. To observe, think, found in daily life what use the stability of the triangle. Key points of Jingjiang Key: this section focuses on the high, median and angle bisector of the triangle. The height of the triangle. (1) definition: from a vertex of a triangle to its opposite sides draw vertical line between the vertex and the pedal called the altitude of a triangle, referred to as high. And the triangle area. The high triangle has three high. The acute triangle three high in a triangle; obtuse triangle only a high inside the triangle, the other two are high in the triangle hypotenuse outside; the high inside the triangle, the other two high is two right angle side. (2) symbol: Figure 7 - 1 - 1, if AF BC in F group, namely / AFB = 90 DEG, down the line AF is ABC in BC on the edge of the high, and vice versa. (3) drawing: draw a triangle on one side of the high, only with vertex relative here, or it is a straight line side draw vertical line between the vertex and the pedal is on the high side. The painting vertical tool is the protractor or triangle plate. Median of a triangle (1) definition: in a triangle, connecting a vertex and the midpoint of the opposite side line is called the median of a triangle triangular midline can turn the triangle into two equal triangles. A triangle has three line, and in t