This graph is NOT bipartite, since there are many triangles in it.
这个图不是二部图，因为里面存在许多三角形。
However, one who demonstrates this for scalene or equilateral triangles does so from principles that are necessarily not first principles.
不过，一个人特别论证不等边三角形或等边三角形，是从必然非第一原理论证。
In each of the following, tell whether the given pair of triangles are congruent or not.
在下列各题中，指出所提供的两个三角形是否必定全等。
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