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三角形的面积比間題,在現行課本中沒有全面地系統地专节讲授,而仅是分配在有关单元或练习題中,有的定理甚至沒有提到。若在課外活动中能系統地給学生讲一讲这些性貭,并利用这些性貭来解决一些繚习題,对于帮助学生进一步掌握基本知識,和培养学生邏輯恩維及解题能力是有好处的。現在提出来供同志們参考。 (1)三角形面积此的基本知識。①任意三角形面积此等于底与高乘积之比; ②等底(或高)三角形面积此等于高(或底)之比; ③一角相等(或互补)的两三角形,面积比等于夹这角两边乘积之比;
The area ratio of the triangles is not systematically and systematically taught in the current textbooks, but is only assigned to relevant units or exercises. Some theorems are not even mentioned. If you can systematically teach students about these sexual ambiguities in extra-curricular activities, and use them to solve some problems, it is beneficial to help students further acquire basic knowledge and develop students’ ability to understand and solve problems. of. It is now proposed for reference by comrades. (1) The basic knowledge of the triangle area. 1 The area of an arbitrary triangle is equal to the ratio of the product of the bottom and the height; 2 The area of the equal bottom (or high) triangle is equal to the ratio of the height (or the bottom); 3 The two triangles with the same (or complementary) angle, and the area ratio is equal to the two sides of the angle Product ratio