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三角形的面积比现行课本没有系统研究,本文就这个问题提出一个值得重视的性质。一、两条基本性质:1.等底(或高)三角形面积比等于高(或底)之比; 2.一角相等(或互补)的两个三角形,面积比等于夹这角两边乘积之比。二、一条推出性质:
The area of the triangle is not systematically studied compared to the current textbooks. This article proposes a noteworthy property on this issue. One or two basic properties: 1. The ratio of the equal bottom (or high) area of the triangle equal to the height (or bottom); 2. The ratio of the two triangles with equal angles (or complementarities) equal to the ratio of the product of the sides of the angle . Second, a launch nature: