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]
Question:
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]
Answer:
Let's think step by step.

user
36
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]
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