Visualising solid shapes puzzle 2

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Across
  1. 3. If all diagonals lie on or inside the polyhedron,it is called
  2. 6. This formula is true for polyhedrons.
  3. 7. EULER’S FORMULA
  4. 9. A hexagonal prism has a____as its base.
Down
  1. 1. is a polyhedron whose base is a polygon and whose lateral faces are triangles with common vertex.
  2. 2. The edges meet at points called
  3. 4. faces meet at line segments called
  4. 5. solids made up of polygonal regions are called
  5. 7. Solids are made up of polygonal regions which are
  6. 8. a prism or pyramid is named after its