The surface area of a triangular prism is S. A. = bh+ (St + S2 + Sa) 4
Where:
b = base of the triangle
h = height of the triangle
S = lateral surface area of the prism
S1, S2, S3 = surface area of the three faces of the prism
Therefore, the formula for the surface area of a triangular prism is the sum of the area of the two triangular bases (bh) and the sum of the lateral surface area and the area of the three faces.