circle's facts--Lucas

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Across
  1. 4. a plane figure with four equal straight sides
  2. 5. a plane figure with eight equal straight sides
  3. 8. a plane figure with seven equal straight sides
  4. 12. a plane figure with three straight sides and three angles.
  5. 13. the distance from the centre to a chord in a circle
  6. 14. a plane figure with five equal straight sides
  7. 16. A triangle with all three sides of equal length
  8. 17. a plane figure with twelve equal straight sides
  9. 18. a plane figure with six equal straight sides
  10. 19. a plane figure with at least three straight sides and angles, and typically five or more.
Down
  1. 1. a circle that passes though all the vertices of the polygon
  2. 2. A triangle with two equal sides.
  3. 3. In geometry it usually means drawing one shape inside another so that it just touches
  4. 6. a four-sided figure.
  5. 7. a plane figure with nine equal straight sides
  6. 9. a polygon that is equiangular (all angles are equal in measure) and equilateral (all sides have the same length)
  7. 10. the center of the incircle of a triangle or other figure
  8. 11. the intersection of the angular bisector of a triangle
  9. 15. a plane figure with ten equal straight sides