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