Willie Irwin (Bonus)

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Across
  1. 3. The set of all points inside a polygon
  2. 5. A polygon in which a diagonal can be drawn such that part of the diagonal contains points in the exterior of the polygon
  3. 14. Lines in the same plane that don't intersect
  4. 15. A polygon in which no diagonal contains points in the exterior of the polygon
  5. 16. A triangle with three acute angles
  6. 19. The common endpoint of the sides of the angle
  7. 21. One of the two parallel sides of a trapezoid
  8. 23. An angle that measures greater than 0 degrees and less than 90 degrees
  9. 24. Planes that don't intersect
  10. 25. A quadrilateral with four congruent sides
Down
  1. 1. A statement that has been proven
  2. 2. A three sided polygon
  3. 4. One of a pair of consecutive angles whose common side is a base of a trapezoid
  4. 6. The distance around the circle
  5. 7. Three or more lines that intersect at one point
  6. 8. The same distance from two or more objects
  7. 9. A quadrilateral with four right angles
  8. 10. Any side of a triangle
  9. 11. Two sides that form a right angle
  10. 12. A quadrilateral with exactly two pairs of congruent consecutive sides
  11. 13. One of the two nonparallel sides of a trapezoid
  12. 17. A quadrilateral with two pairs of parallel sides
  13. 18. To divide into two congruent parts
  14. 20. The set of all points outside a polygon
  15. 22. A segment connecting two nonconsecutive vertices of a polygon