geometry crossward

3. to divide into two congruent parts
4. an undefined term thought of as a location with no size or dimension
6. you define this term in the investigation special polygon
8. a tool used to construct circles
10. the point on the line segment that is the same distance from both endpoints
11. an undefined term thought of as a straight
13. a point on a line, and all the points of the line that lie on one side of this point
14. the line of reflection of a figure having reflectional symmetry
15. the property that a figure coincides with itself under a reflection
17. an undefined term thought of as a flat surface that extends infinitely along its edges
18. in the same plane
19. the point at either end of a segment or an arc, or the first point of a ray

1. two points and all the points between them that are collinear with the two points
2. reflectional symmetry with only one line of symmetry
5. the property that a figure coincides itself under some rotation
7. a statement that clarifies or explains the meaning of a word or phrase
9. a tool used to construct lines,rays, and line segments
12. the property that a figure coincides with itself under an isometry
16. on the same line