Mathematics Crossword Puzzle

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Across
  1. 11. a quadrilateral with exactly one pair of opposite sides parallel
  2. 13. a polygon with eleven sides
  3. 14. a polygon with ten sides
  4. 15. a closed plane figure consists of four line segments
  5. 17. quadrilateral has _____ number of vertices
  6. 19. angles that shares a common side and vertex but no interior points in common
  7. 23. a polygon with equal angles
  8. 27. it is an angle that forms a straight line
  9. 29. a three-sided polygon
  10. 30. it is represented by a dot
  11. 32. segment, it is a portion of a line
  12. 34. revolution, it is an angle in a complete rotation
  13. 35. a polygon with equal sides
  14. 36. a polygon with twelve sides
  15. 37. this is where the edges meet
  16. 40. a polygon's boundary
  17. 41. a six-sided polygon
  18. 42. a polygon with all interior angles < 180°
  19. 44. an angle with a measure of 90°
  20. 47. two angles whose sum of the measures is 90°
  21. 48. angle less than 90 degrees (6)
Down
  1. 1. lines that do not intersect
  2. 2. two angles whose sum of the measures is 180°
  3. 3. a trapezoid with congruent legs
  4. 4. it is the sum of a polygon's side lengths
  5. 5. two nonadjacent angles formed by two intersecting lines
  6. 6. a rectangle with all four sides congruent
  7. 7. a statement that needs to be proven before being accepted
  8. 8. a line segment joining two nonconsecutive vertices of a polygon
  9. 9. lines that intersect and form a right angle
  10. 10. a line segment has _____ endpoints
  11. 12. a geometric surface with length and width
  12. 16. a quadrilateral with two pairs of congruent and adjacent sides
  13. 18. a polygon is _____ if its sides and angles are equal
  14. 20. angles that are formed by a base and legs
  15. 21. a seven-sided polygon
  16. 22. a parallelogram with four right angles
  17. 24. a parallelogram with all four sides congruent
  18. 25. angle greater than 90 degrees
  19. 26. a polygon's building block
  20. 28. a branch of math that deals with shapes
  21. 30. a five-sided polygon
  22. 31. a quadrilateral with two pairs of opposite sides that are parallel
  23. 33. a nine-sided polygon
  24. 38. the property of a parallelogram's opposite sides is _____.
  25. 39. the sum of ______ angles in a quadrilateral is 360°
  26. 42. polygon with at least one interior angle > 180°
  27. 43. a polygon with unequal sides/angles
  28. 45. an angle greater than 180° but less than 360° is called ______.
  29. 46. an eight-sided polygon