The formula for the surface area of a triangular prism can be completed as follows:
The surface area of a triangular prism is
\( S.A. = \text{Base Area} + (S_1 + S_2 + S_3) \)
Where:
- "Base Area" refers to the area of the triangular base of the prism.
- \( S_1, S_2, \) and \( S_3 \) are the areas of the three rectangular lateral faces of the prism.