geometry crossword

2. the point of concurrency of the 3 perpendicular bisectors of a triangle
3. bisector:a segment, ray, line, or plane that is perpendicular to a segment at its midpoint
4. the segment connecting the midpoint of 2 sides of a triangle is parallel to the third side and half as long as the side
7. a segment from a vertex to the midpoint of the opposite side
9. negating and using the converse
11. do not intersect and are not co-planar
12. the point of concurrency of the 3 angle bisectors of a triangle
15. angle formed outside of a polygon when the original sides are extended
17. of concurrency: the point where 3 or more lines, rays, or segments intersect
18. negate hypothesis and conclusion
19. the perpendicular segment from a vertex to the opposite side or to the line that contains the opposite side

1. the point of concurrency of the three medians
2. angles that are in the same position
5. segment that connects the midpoints of 2 sides of a triangle
6. endpoint of a side
8. switch hypothesis and conclusion
10. angle inside of a polygon
13. all sides are congruent
14. a line that intersects 2 or more co-planar lines at different points
16. the altitudes of a triangle are congruent and meet at a point called this