正三角形 meaning in English

[数学] regular triangle

Each face is an equilateral triangle and three faces meet at each vertex .
每一个面是正三角形并且于每一个顶点处有三个面相交。
The smallest inscribled regular triangle of a triangle
三角形的最小内接正三角形
Maximal size of the regular triangles inscribed in a triangle
三角形的内接最大正三角形
The minimum area of regular inscribed triangles in a triangle
三角形内接正三角形的最小面积
These are regular triangles in non - euclidean plane
这些都是非欧平面上的正三角形，像不像扇子？

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