circle's facts--Lucas

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