Final answer:
To calculate the surface area of the equilateral triangular faces of the pyramid, more information is needed to find the length of the base of the triangles.
Step-by-step explanation:
The surface area of a pyramid whose triangular faces are all equilateral with a height of 5.2 cm can be calculated by finding the area of one triangle and multiplying it by the number of triangles (usually 4 for a pyramid with a square base or 3 for a tetrahedron). The formula for the area of a triangle is 1/2 × base × height. However, as the question does not provide the length of the base, it is not possible to calculate the exact surface area without this information. The student should double-check the question to verify if the length of the base is given elsewhere or if additional data is provided that would allow for an indirect calculation of the base.