直角坐标系在三角形问题中的妙用

The Magical Effect of Rectangular Coordinate System in Triangle Problems

三角形是最常见的几何图形之一,其中各种性质、关系结论较多。如能适当选取直角坐标系,将三角形置于坐标背景下,求设各顶点坐标,则可将三角问题坐标化。再结合三角形的几何特征及有关定理,利用解析法求三角形的边角、面积等。

The triangle which has many features is one of the most common geometric figures. If proper rect- angular coordinate system is chosen, the triangle is put under coordinate background, the triangle problems can be solved in the form of coordinate. Combined with the geometric features of the triangle and the related theories, the use of the analytic method can be put into solve the problems of triangle.