Across
- 4. in the same plane.
- 5. a plane figure with at least three straight sides and angles, and typically five or more.
- 6. Postulate is a true statement, which does not require to be proved.
- 8. a ray on the opposite of the other ray
- 12. the enclosing boundary of a curved geometric figure, esp. a circle.
- 14. an angle less than 90 degrees but more than 0 degrees
- 15. Both of two angles whose sum is 90°
- 18. a point or line common to lines or surfaces that intersect.
- 19. having all its sides of the same length.
Down
- 1. the figure formed by two rays sharing a common endpoint.
- 2. The two supplementary adjacent angles formed by two intersecting lines
- 3. the exact middle point.
- 7. Line segments that have the same length.
- 9. having equal angles.
- 10. the characterization and study of sets of points based only on given values of the distances between member pairs.
- 11. Both of two angles whose sum is 180°
- 13. the continuous line forming the boundary of a closed geometric figure.
- 15. (of points) lying in the same straight line.
- 16. a line segment is a part of a line that is bounded by two end points, and contains every point on the line between its end points.
- 17. the use of algebra to study geometric properties; operates on symbols defined in a coordinate system
- 20. A ray is a line that starts at a given point and goes off for ever in some direction.