1. The problem asks for the number of edges in a square-based pyramid once it is built. 2. A square-based pyramid consists of a square base and four triangular faces meeting at a single apex. 3. The formula to find the number of edges in a pyramid is to count the edges of the base plus the edges connecting the base to the apex. 4. The square base has 4 edges. 5. Each of the 4 vertices of the square base connects to the apex, adding 4 more edges. 6. Therefore, total edges = edges of base + edges from base vertices to apex = 4 + 4 = 8. 7. So, the square-based pyramid has 8 edges once built.