There’re some unresolved problems of triangle so far. For example, whether there’s a three middle integer Helen triangle? It is unable to prove its existence until now; they have not found such a triangle. But I' m sure you can solve this problem. Now, there is an equilateral triangle(等边三角形),each edge is divided into two equal parts. Such as the picture
and if each edge is divided into three equal parts,
the triangle becomes
,now you task is to count the number of triangles, diamonds(菱形), and parallelograms(平行四边形).