Circle Review

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Across
  1. 3. point where the internal angle bisectors of the triangle cross
  2. 4. a flat shape with nine straight sides
  3. 7. angle an angle on the inside of a triangle or other polygon
  4. 10. circle the circumscribed circle or circumcircle of a polygon is a circle which passes through all the vertices of the polygon
  5. 11. polygon polygon with all sides and all angles equal
  6. 14. to divide something into two, usually equal, parts
  7. 15. triangle a triangle with two sides of equal length
  8. 17. a straight line connecting two points on a curve
  9. 19. at an angle of 90° to a horizontal line or surface
  10. 21. a straight line that reaches from one point on the edge of a round shape or object, through its centre, to a point on the opposite edge
  11. 23. an occasion when two lines cross, or the place where this happens
  12. 24. a flat shape with seven straight sides
  13. 25. a flat shape with three or more straight sides
  14. 26. a flat shape with ten straight sides
  15. 27. tangent one circle is at the outside of another circle and they only have one intersection
  16. 28. a straight line that touches but does not cut into a curve
  17. 30. a plane figure bounded by two radii and the included arc of a circle
Down
  1. 1. a flat shape with three straight sides
  2. 2. a line that crosses a circle at two places
  3. 5. a flat shape with four straight sides
  4. 6. the line surrounding a circular space, or the length of this line
  5. 8. a flat shape with eight straight sides
  6. 9. a straight line joining the centre of a circle to its edge or the centre of a sphere to its surface
  7. 12. triangle a triangle that has all sides the same length
  8. 13. triangle a triangle in a circle, that the three vertex are on the circle
  9. 14. the common center of mass around which two or more bodies revolve
  10. 15. tangent one circle in another circle and they only have one intersection
  11. 16. a flat shape with four sides of equal length and four angles of 90°
  12. 18. a flat shape with six straight sides
  13. 20. a shape with five sides and five angles
  14. 22. angle he supplement of an interior angle of a polygon
  15. 29. the perpendicular line or distance from the centre of a regular polygon to any of its sides