11. Nanako said she drew a square pyramid and that all of the faces are triangles. Is this possible? Explain.

Nanako might have a bit of a mix-up! A square pyramid has one square base and four triangular faces that meet at a single apex. So, if she's envisioning all the faces as triangles, she's likely picturing a different shape altogether, like a tetrahedron, which has four triangular faces. But in a square pyramid, the square base is essential for its definition! If she wants to draw a shape with all triangular faces, she should try sketching a tetrahedron instead! That way, every face will indeed be a triangle, and she'll be right on target.