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一、平面几何图形的自由度简介: 所谓自由度就是指确定平面几何图形的形状、大小的元素。 1.三角形的自由度 (1)任意三角形有三个自由度(其中至少有一元素是边,或能确定几何图形大小的元素,如三角形的外接圆半径、内切圆半径等。) (2)特殊三角形的自由度(由于概念内涵增加,自由度就减少。) (a) 等腰三角形与直角三角形均有两个自由度(设一边一角为宜)。
First, the degree of freedom of the plane geometry Introduction: The so-called degree of freedom is to determine the shape of the plane geometry, the size of the element. 1. The degree of freedom of a triangle (1) An arbitrary triangle has three degrees of freedom (in which at least one element is an edge, or an element that can determine the size of a geometric shape, such as the radius of a circumscribed circle of a triangle, the radius of an inscribed circle, etc.) (2) Special The degree of freedom of the triangle (the degree of freedom decreases as the concept connotation increases.) (a) Both isosceles triangles and right-angle triangles have two degrees of freedom (it is appropriate to have one corner and one corner).