Circle

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Across
  1. 1. a part of a circle lying between two straight lines drawn from the centre to the edge
  2. 4. a straight line between the centre of a circle and any point on its outer edge; the length of this line
  3. 9. a flat shape with ten straight sides and ten angles
  4. 10. a line segment from the center to the midpoint of one of its sides
  5. 11. an angle formed between the side of a shape and the side next to it, when this side is made longer
  6. 12. a flat shape with three straight sides and three angles; a thing in the shape of a triangle
  7. 13. a straight line that touches the outside of a curve but does not cross it
  8. 15. is a circle that passes through all the vertices of the polygon
  9. 21. the Internal tangent
  10. 22. to divide sth into two equal parts
  11. 26. a flat shape with six straight sides and six angles
  12. 27. a flat shape with eight straight sides and eight angles
  13. 28. a straight line that joins two points on a curve
  14. 30. a flat shape with seven straight sides and seven angles
  15. 31. the external tangent
  16. 32. a straight line that intersects a curve at two or more points
Down
  1. 2. a line that goes around a circle or any other curved shape; the length of this line
  2. 3. a flat shape with five straight sides and five angles
  3. 5. having four straight equal sides and four angles of 90˚
  4. 6. a flat shape with at least three straight sides and angles, and usually five or more
  5. 7. a point defined for any triangle in a way that is independent of the triangle's placement or scale.
  6. 8. a flat shape with twelve straight sides and twelve angles
  7. 11. a triangle whose three sides are all the same length
  8. 14. a polygon with all sides and all angles equal
  9. 16. Inside triangle of circle
  10. 17. is a triangle that has two sides of equal length
  11. 18. the act of intersecting sth
  12. 19. an angle formed inside a shape where two sides of the shape meet
  13. 20. forming an angle of 90˚ with another line or surface; vertical and going straight up
  14. 23. a flat shape with four straight sides
  15. 24. a flat shape with nine straight sides and nine angles
  16. 25. the common center of mass around which two or more bodies revolve
  17. 29. a straight line going from one side of a circle or any other round object to the other side, passing through the centre