The formula you provided for the surface area of a triangular pyramid appears to have a typographical error. The correct formula for the surface area (SA) of a triangular pyramid is generally based on the area of the triangular base and the area of the three triangular lateral faces.
Given the corrected context, the surface area formula involves calculating:
- The area of the triangular base: \( A_{base} = \frac{1}{2} \times \text{base} \times \text{height} \) (area of a triangle).
- The area of the three triangular lateral faces, which can be derived based on the slant height and base lengths of each face.
Thus, the concept that is primarily being used in the calculation of the surface area of a triangular pyramid is the area of a triangle.
Therefore, the correct response from the provided options would be area of a triangle.
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