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三角形全等是平面几何中的重要内容,许多几何问题,可以利用三角形全等来解决．例如证明两边相等、两角相等、两条直线平行或垂直等等．
Triangle congruence is an important content in plane geometry. Many geometric problems can be solved by using triangle congruence. For example, it is proved that the two sides are equal, two corners are equal, two straight lines are parallel or perpendicular and so on.