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图3是由同样大小的等边三角形所组成的。
Diagram 3 consists of several equilateral triangles of equal size.
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正方形有四个等边和四个九十度的角。
A square has four equal sides and four 90-degree angles.
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正方形有四个等边和四个九十度的角。
A square has four equal sides and four 90-degree angles.
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