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能够完全重合的两个三角形叫做全等三角形,这两个三角形的对应元素都相等.当两个三角形的位置、方向不同,或者两个三角形有重叠时,确定它们的对应元素有时不很方便.下面介
The two triangles that can be completely coincident are called congruent triangles. The corresponding elements of the two triangles are equal. When two triangles have different positions and directions, or two triangles overlap, it is sometimes not convenient to determine their corresponding elements. Below