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