Final answer:
To find the total surface area of a square pyramid, calculate the area of the base and the four triangular faces, then add them together.
Step-by-step explanation:
The total surface area of a square pyramid can be found by adding together the areas of all its faces.
Step 1: Determine the area of the base of the pyramid. For a square pyramid, this is equal to the side length squared.
Step 2: Determine the area of the four triangular faces. Each triangular face has a base equal to the side length of the pyramid and a height equal to the slant height of the pyramid.
Step 3: Add together the area of the base and the four triangular faces to find the total surface area of the pyramid.
Using this method, we can find that the total surface area of the square pyramid is 120 cm², which corresponds to option (B).