There are nine unit triangles in the three rows of this triangle. If you add three more rows to the bottom of this triangle so that each row has 2 more unit triangles than the previous row, how many unit triangles will there be?

[asy]
draw((0,0)--(15,26)--(30,0)--cycle);
draw((5,8.7)--(10,0)--(20,17.3));
draw((20,0)--(25,8.7)--(5,8.7));
draw((20,0)--(10,17.3)--(20,17.3));
[/asy]
There are 7 triangles in the next row after the third, 9 in the next row after that, and 11 in the row after that. After adding three rows, there are $9+7+9+11=36$ triangles total.