geometry crossword

5. three side polygon
7. segment, is a part of a line with two endpoints.
8. lines that intersects
10. action of rotating around an axis or center
11. angles ,Two angles whose measures equal 90 degrees
13. each angular point of a polygon
15. is a part of a line that has one endpoint and continues on forever in one direction

1. gram opposite sides are parallel and congruent (two sets of parallel lines ), opposite angles are congruent
2. round plane figure whose boundary consists of points equidistant from a fixed point
3. is a straight path of points that goes on and on in opposite directions.
4. the conceptual operation of inverting a system or event with respect to a plane
6. is a dot in a plane or a piece of paper.
9. only two sides are equal for this triangle
12. part of the circumference of a circle or other curve
14. movement of a body from one point of space to another such that every point of the body moves in the same direction