Geometry

5. the point at which the three medians intersect in a triangle
7. lines that never touch
9. a closed figure formed by three or more line segments called sides
11. equals 90 degrees
12. A segment that joins the midpoint of two sides of a triangle
14. angles angles that are across for each other and are equal
18. a line that passes through two parallel lines
19. a segment joining a vertex to the opposite side so that it is perpendicular to that side

1. a closed four sided shape
2. two angles that are next to each other and share a common side
3. bisects the angle
4. equals 180 degrees
6. an angle in the inside of a shape
8. a flat surface made up of points and extends infinitely in all directions
10. a segment that connects a vertex of a triangle to the midpoint of the opposite side
13. the outside of a angle
15. the intersection of two orays at an endpoint
16. a measurable part of a line consisting of two end point
17. a location with no shape or size