Geometric Wonders

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Across
  1. 1. geometric figure with parallelogram sides and two similar end faces
  2. 5. mathematical study of properties and relationships of shapes
  3. 8. most talented mathematician of Middle Ages
  4. 10. shapes or figures that spin in any direction
  5. 11. shapes that slide from one place to another
  6. 12. 3D structure with triangular sides that meet at single point on top
  7. 13. Triangle, a fractal of triangles subdivided into smaller equal triangles
Down
  1. 2. Helge von Koch identified this fractal
  2. 3. tiling of a plane using one or more geometric shapes
  3. 4. shapes that are mirror images of each other
  4. 6. surprise with remarkable properties or abilities
  5. 7. Sequence, each number is the sum of the two preceding ones
  6. 9. something wrongly perceived by our senses