Geometry Crossword

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Across
  1. 3. a line that crosses at least 2 other lines
  2. 10. angles that are on the outside of a transversal
  3. 12. the point at which the perpendicular bisectors of the sides of a triangle intersect
  4. 14. instead of proving the conclusion true you prove all the alternatives false
  5. 15. angles that are formed when two parallel lines are intersected by the transversal
  6. 17. a pair of angles on one side of a transversal line
  7. 18. a line segment drawn from a vertex to the midpoint of the opposite side of the vertex
  8. 19. lines that have no intersection but are not parallel
  9. 20. a theorem connected by a short proof to an existing theorem
Down
  1. 1. a segment that connects the midpoints of two sides of the triangle
  2. 2. a point or line the same distance from each other
  3. 4. the longest side of a right triangle
  4. 5. the angle between a side of a polygon and an extended adjacent angle
  5. 6. angles that are on the inside of a transversal
  6. 7. lines on a plane that never meet
  7. 8. the perpendicular segment from a vertex of a triangle to the opposite side
  8. 9. the point of a triangle where the three medians coincide
  9. 11. lines that all intersect at the same point are
  10. 13. the center of a incircle for a polygon
  11. 16. the common intersections of the three altitudes of a triangle