Geometry

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Across
  1. 1. This shapes diagonals bisect each other at 90 degrees
  2. 7. A pair of angles creating a Z shape
  3. 9. This shape is a parallelogram with 4 equal sides
  4. 12. A pair of angles adding to 90 degrees
  5. 13. This shape has opposite sides parallel
  6. 14. A polygon with an angle sum of 180 degrees
  7. 17. A pair of angles creating a U shape
Down
  1. 1. Any chord automatically creates two of these - one major and one minor
  2. 2. Half a diameter
  3. 3. Part of the circle that reminds you of a slice of pizza
  4. 4. This shapes diagonals bisect each other, but not at 90 degrees
  5. 5. A straight line joining two points on the circumference
  6. 6. A polygon with an angle sum of 360 degrees
  7. 8. A pair of angles adding to 180 degrees
  8. 10. A pair of angles creating a F shape
  9. 11. A pair of angles next to each other
  10. 15. Part of the circumference
  11. 16. This shape has 2 pairs of adjacent equal sides
  12. 18. This shape only has one pair of parallel sides