As shown in the picture, use toothpicks to draw patterns according to certain rules. . . Master, come down.

The first figure has 1 layer, and 1 triangle is 3* 1.

The second graph has two layers, 1+2 triangles as 3*(2+ 1) roots.

The third graph has three layers, 1+2+3 triangles and 3*( 1+2+3) roots.

The nth graph has (1+2+3+4+...+N) triangles with 3 * (1+2+3+4+ ... +N) roots.

So the tenth one has 3 * (1+2+3+4+5+6+7+8+9+10) =165.