Space and Geometry

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Across
  1. 3. A shape that has no sides and angles the same
  2. 5. When 2 angles add up to 180
  3. 7. A shape with 4 sides
  4. 9. Move a shape by sliding
  5. 12. Where all sides and angles are equal
  6. 13. When 2 angles add up to 90
  7. 15. A line that runs from one vertices to another non-adjacent one
  8. 16. Circles that have the same centre
  9. 18. A line that goes from one point on the circumference to another without passing through the middle
Down
  1. 1. A triangle with 2 sides and 2 angles the same
  2. 2. A triangle with all angles and sides the same
  3. 4. Corners where lines on shapes converge
  4. 6. A shape with 2 sets of parallel sides
  5. 8. Top point on a pyramid
  6. 10. A triangle with no sides and no angles the same
  7. 11. When all lines meet at a point
  8. 14. Has a uniform cross-section
  9. 17. Number of sets of parallel lines on a hexagon