所有这些都是全等三角形。
比对过程中首先根据两个集合中的全等三角形求出它们的旋转和平移参数，然后对根据参数进行转换后的特征集合进行点模式匹配。
In the matching process the parameters of rotation and displacement were obtained by two congruent triangles, then the point-pairs matching would be performed on the transformed sets.
你可以使用初等的几何知识例如三角形的三个内角各为180度和三角形全等的规则(边-角-边等)。
You may only use elementary geometry, such as the fact that the angles of a triangle add up to 180 degrees and the basic congruent triangle rules (side-angle-side, etc.).
在下列各题中，指出所提供的两个三角形是否必定全等。
In each of the following, tell whether the given pair of triangles are congruent or not.
译：当两个三角形象下面所示有两个角和一个边同时相等时，这两个三角形全等。
Angle-angle-side congruence. when two triangles have corresponding angles and sides that are congruent as shown below the triangles are congruent .
蝶形单元是由两个全等的三角形组成。
Butterfly Mechanism consists of two congruent equilateral triangles.
蝶形单元是由两个全等的三角形组成。
Butterfly Mechanism consists of two congruent equilateral triangles.
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