Geometry vocabulary by Ruben

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Across
  1. 3. (of a triangle) the longest of the three sides
  2. 6. a smooth curve joining two points
  3. 7. a five-sided polygon
  4. 13. a line exactly 90 degrees in comparison to another line
  5. 15. a type of triangle with three different sized angles
  6. 16. (of an angle) between 90 and 180 degrees
  7. 17. neighbouring each other
  8. 18. a triangle with inner angles of 60 degrees
Down
  1. 1. a mirror/glass that refracts light inwards
  2. 2. a six-sided polygon
  3. 4. a four-sided shape
  4. 5. exactly the same across one line
  5. 7. Two lines that will never meet
  6. 8. A quadrilateral with one pair of parallel lines
  7. 9. a mirror/glass that refracts light outwards
  8. 10. a line going from the right side to the left or vice versa
  9. 11. the same as
  10. 12. a line going from the top to the bottom or vice versa
  11. 14. This shape gets its name from the shape on its bottom side