circle's facts

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Across
  1. 3. the plane figure enclosed by two radii of a circle or ellipse and the arc between them.
  2. 5. the enclosing boundary of a curved geometric figure, especially a circle.
  3. 8. a plane figure with six equal straight sides
  4. 10. a plane figure with twelve equal straight sides
  5. 11. the center of the incircle of a triangle or other figure
  6. 15. A triangle with all three sides of equal length
  7. 17. divide (a line, angle, shape, etc.) into two equal parts.
  8. 19. a plane figure with five equal straight sides
  9. 20. the angle between a side of a rectilinear figure and an adjacent side extended outward.
  10. 21. a four-sided figure.
  11. 24. a line touching only a point on a circle
  12. 25. In geometry it usually means drawing one shape inside another so that it just touches
  13. 27. the distance from the centre to a chord in a circle
  14. 29. the set of points which are an equal distance to a fixed point
  15. 31. a plane figure with at least three straight sides and angles, and typically five or more.
  16. 32. A triangle with two equal sides.
  17. 34. a plane figure with seven equal straight sides
Down
  1. 1. a plane figure with four equal straight sides
  2. 2. the intersection of the angular bisector of a triangle
  3. 4. the angle between adjacent sides of a rectilinear figure.
  4. 6. a plane figure with ten equal straight sides
  5. 7. a point or line common to lines or surfaces that intersect.
  6. 9. a plane figure with eight equal straight sides
  7. 12. a polygon that is equiangular (all angles are equal in measure) and equilateral (all sides have the same length)
  8. 13. a circle that passes though all the vertices of the polygon
  9. 14. a plane figure with three straight sides and three angles.
  10. 16. they intersect in exactly one point and their intersection of their interiors is empty.
  11. 18. a straight line passing from side to side through the center of a body or figure, especially a circle or sphere.
  12. 22. at an angle of 90° to a given line, plane, or surface.
  13. 23. two circles is a tangent of both circles that intersects the segment joining the centers of two circles.
  14. 26. a plane figure with nine equal straight sides
  15. 28. a line cutting through a circle
  16. 30. a straight line from the center to the circumference of a circle or sphere.
  17. 33. a line segment whose endpoints both lie on a circle