3D shapes

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Across
  1. 3. An octagonal pyramid has 9 ... ?
  2. 4. It's the art of representing three-dimensional objects on a two-dimensional surface.
  3. 7. It's a traditionnal British and Irish baked biscuit, popular in the UK, usually made of flour with baking powder then baked on a baking tray.
  4. 9. What are solids called when all their faces are polygons ?
  5. 10. My 4 faces are triangles.
Down
  1. 1. If a 3D shape is opened out flat, we get its ...
  2. 2. It's the form of the stones at the Giant's Causeway in Northern Ireland.
  3. 5. When tea is poured correctly from a teapot,it flows through the ...
  4. 6. It's where 2 edges meet.
  5. 8. I'm a solidand all my faces are rectangles.