“相似三角形”的主要性质是对应边成比例,对应角相等.在物理中,一般地,当涉及到矢量运算,又构建了三角形时,可考虑用相似三角形.下面以静力学为例说明其应用. 例1 如图1所示,支架ABC,其中AB=2.7m,AC=1.8m,BC=3.6m,在B点挂一重物,G=500N,求AB、BC上的受力. The main property of “similar triangles” is that the corresponding edges are proportional and the corresponding angles are equal. In physics, generally, when it comes to vector operations and triangles are constructed, similar triangles can be considered. The following is an example of statics Application Example 1 As shown in Figure 1, the bracket ABC, where AB = 2.7m, AC = 1.8m, BC = 3.6m, hung a heavy object at point B, G = 500N, seeking AB, BC force.