Shape shifting!

1234567891011121314151617181920
Across
  1. 5. It has two faces and no edges.
  2. 10. Any four sided shape.
  3. 11. Where two sides meet.
  4. 14. Where two faces meet.
  5. 15. Has three sides and three angles.
  6. 16. It has one face and no faces or vertices.
  7. 17. Has four sides, but two are longer than the others.
  8. 18. It is round and flat.
  9. 19. A cube and rectangular prism have six of these.
  10. 20. Has no faces, edges or vertices.
Down
  1. 1. Has five sides and five angles.
  2. 2. One of the line segments that make up a shape.
  3. 3. prism Has six faces, two are squares and four are rectangles.
  4. 4. To divide into groups or "break up".
  5. 6. A quadrilateral like a squashed square.
  6. 7. Shapes can be two or three _____________.
  7. 8. Has four equal sides.
  8. 9. Its faces are made of 4 triangles and a square.
  9. 12. It has six sides.
  10. 13. Where 3 or more edges meet.
  11. 18. Has six equal faces.