An icosahedron with twenty equilateral triangles as faces.

有二十个正三角形面的二十面体。

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Diagram 3 consists of several equilateral triangles of equal size.

图3是由同样大小的等边三角形所组成的。

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But our intrepid geometers found that by using equilateral triangles rather than squares, they could generate a savings of 0.1 percent.

但我们坚韧不拔的几何学家们发现，如果用等边三角形而非正方形的话，可以省下0.1%的包装材料。

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