Geometry Crossword

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Across
  1. 1. A polygon that is equilateral and equiangular.
  2. 11. An angle whose measure is more than 90° and less than 180°.
  3. 14. A two-dimensional shape in which all points on the curved line are equidistant from a center point.
  4. 15. A triangle with three acute angles.
  5. 18. Two lines that intersect to form a right angle.
  6. 19. A collection of points along a straight path that extends endlessly in both directions.
  7. 20. A proof in which you prove that a statement is true by first assuming that its opposite is true. If this assumption leads to an impossibility, then you have proved that the original statement is true.
  8. 23. A closed figure with six sides.
  9. 24. The point of concurrency of the angle bisectors of a triangle.
  10. 25. A quadrilateral with both pairs of opposite sides parallel.
  11. 28. A triangle with one right angle.
  12. 32. Two lines that meet to make a corner.
  13. 33. A two-dimensional, closed, four-sided figure with four right angles.
  14. 34. The perpendicular segment from a vertex of a triangle to the opposite side or to the line that contains the opposite side.
  15. 36. Identical in size and shape.
  16. 37. A special type of rectangle that has equilateral (same length) sides and parallel opposite sides.
  17. 38. A plane figure that meets the following two conditions. 1. It is formed by three or more segments called sides, such that no two sides with a common endpoint are collinear. 2. Each side intersects exactly two other sides, one at each endpoint.
  18. 40. A figure formed by three segments joining three noncollinear points, called vertices.
  19. 41. A closed figure with seven sides.
  20. 42. Sides that are the same length.
  21. 44. The point of concurrency of the lines containing the altitudes of a triangle.
  22. 47. A segment, ray, line, or plane that is perpendicular to a segment at its midpoint.
  23. 48. A triangle with three congruent angles.
Down
  1. 2. A ray that divides an angle into two adjacent angles that are congruent
  2. 3. The point of concurrency of the perpendicular bisectors of a triangle.
  3. 4. A triangle with at least two congruent sides.
  4. 5. A polygon such that no line containing a side of the polygon contains a point in the interior of the polygon.
  5. 6. A line that intersects two or more coplanar lines at different points.
  6. 7. A part of a line having two endpoints.
  7. 8. Two lines in the same plane that do not intersect.
  8. 9. A triangle with one obtuse angle.
  9. 10. Three or more lines that intersect in the same point.
  10. 12. A triangle with no congruent sides.
  11. 13. An angle whose measure is less than 90°.
  12. 16. A triangle with three congruent sides.
  13. 17. Points that lie on the same plane.
  14. 21. A statement that can be proven
  15. 22. Two angles with equal measure formed by two intersecting lines.
  16. 26. A continuous portion of a circle
  17. 27. A closed figure with eight sides.
  18. 29. A closed figure with five sides.
  19. 30. A flat surface that extends endlessly in all directions.
  20. 31. The point of concurrency of the medians of a triangle.
  21. 35. A closed four-sided figure with parallel opposite sides. A square is a special kind of rhombus. Sometimes called a diamond.
  22. 39. Points that lie on the same line.
  23. 41. Two lines that do NOT intersect and are NOT coplanar.
  24. 43. A specific position on a line, plane, or in space.
  25. 45. A part of a line having only one endpoint.
  26. 46. Line segments in geometric figures that compose the exterior of the object.