Because a triangular pyramid has 6 edges
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a triangular pyramid...
2 - a Triangular Prism has 6, a Triangular Pyramid (Tetrahedron) has 4.
Triangular prism has 6. Triangular pyramid has 4. Answer: 2 more vertices.
9 for prism, 6 for pyramid
A triangular pyramid has 4 faces and has 6 edges