Geometry

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Across
  1. 4. a plane figure with six straight sides and angles.
  2. 8. a quadrilateral with no sides parallel.
  3. 9. a four-sided plane rectilinear figure with opposite sides parallel.
  4. 11. a plane figure with five straight sides and five angles.
  5. 12. a triangle in which all three sides are equal
  6. 13. two lines that are always the same distance apart and never touch
Down
  1. 1. a flat surface on which a straight line joining any two points on it would wholly lie - "the horizontal ….."
  2. 2. a plane figure with eight straight sides and eight angles.
  3. 3. a triangle that has two sides of equal length
  4. 5. two lines that share exactly one point
  5. 6. a right-angled triangle.
  6. 7. a four-sided figure.
  7. 9. the relationship between two lines which meet at a right angle (90 degrees)
  8. 10. a 4-sided flat shape with straight sides where all sides have equal length - opposite sides are parallel and opposite angles are equal