CIRCLE REVIEW 刘卿蓥

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