To calculate the volume of a prism, you can use the formula:
\[ \text{Volume} = \text{Base Area} \times \text{Height} \]
First, we need to determine the base area. Since you mentioned a side length of 3, a height of 12, and a width of 9, it sounds like you might be referring to a rectangular prism, where the base area is calculated as:
\[ \text{Base Area} = \text{Width} \times \text{Length} \]
In this case, let's assume the given "side length" refers to one dimension, possibly corresponding to the length of the base of the prism.
Given:
- Width = 9
- Length = Side Length = 3
- Height = 12
We can calculate the base area:
\[ \text{Base Area} = 3 \times 9 = 27 \]
Next, we calculate the volume:
\[ \text{Volume} = \text{Base Area} \times \text{Height} = 27 \times 12 = 324 \]
Thus, the volume of the prism is:
\[ \boxed{324} \]
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