Let's analyze the pattern in the given figures.
In the first triangle:
\[
4 \times 6 + 9 = 38
\]
In the second triangle:
\[
8 \times 9 + 11 = 56
\]
Using the same pattern for the third triangle:
\[
12 \times 13 + 11 = 108
\]
Thus, the correct answer is (C) 108.