a, b, c - length of edges of a base. H - height. The triangular prism has 5 faces, 9 edges, 6 vertices. Angles in triangular prism. The triangular right prism has in the base equilateral triangle. The volume and the surface find in the same way as all prisms: V = A_bH, S = 2A_b +A_f. H - height, A_b - area of a base (triangle), A_l - lateral surface area (sum of areas of rectangles).