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相似三角形判定定理:平行于三角形一边的直线和其他两边相交,所构成的三角形与原三角形相似.如图1,△ABC∽△ADE,上图我们俗称A型图.如果我们规定:(1)公共顶点A称为连体点,(2)△ABC和△ADE称为连体三角形,(3)∠BAC=∠DAE称为连体角,(4)具有连体点的边AB、AC、AD、AE称为连体边,AB与AD、AC与AE称为连体对应边.(5)以连体点为旋转中心,将连体图形旋转分
Similar triangle decision theorem: parallel to one side of the triangle line and the other two intersect, the triangle formed by the original triangle similar to Figure 1, △ ABC ∽ △ ADE, the above we are commonly known as A-type map if we provide: (1) (2) △ ABC and △ ADE are called conjoined triangles, (3) ∠BAC = ∠DAE is called conjoined angle, and (4) edges with conjunctive points AB, AC, AD, AE is called Siamese side, AB and AD, AC and AE are called Siamese corresponding side. (5) Siamese points as the rotation center, the Siamese graphic rotation points