Geometry

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Across
  1. 2. a 3 sided 2D figure
  2. 5. a 3D shape with at least 2 congruent sides
  3. 8. four sided figure
  4. 9. a side of a 3D shape
  5. 13. a shape with a circular face and one vertex
  6. 14. a 3D shape with a rectangular base
  7. 15. a 3D shape with a triangular base
  8. 17. 4 sided figure, all sides and angles are equal
  9. 18. a shape with 8 sides
  10. 20. where two faces meet
Down
  1. 1. a shape with 2 circular faces and no vertices
  2. 3. 4 equal sides, opposite sides are parallel and opposite angles are equal
  3. 4. a shape with 2 sets of parallel sides
  4. 5. a 5 sided figure
  5. 6. 3D circular figure
  6. 7. a quadrilateral with 1 set of parallel sides
  7. 10. any closed straight edged figure
  8. 11. a shape with 6 sides
  9. 12. a "corner" or point of a 3D shape
  10. 16. a 2D shape with parallel opposite sides and right angles
  11. 19. a 3D shape where all faces are the same size