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Across 1. Two rays that extend in opposite directions, but start at the same point. 7. A 90° angle. 9. Lines that intersect to make a right angle. 12. Flat surface extending in all directions. 13. When two angles are the same. 15. Where two rays make an angle meet. 16. When a shape is the same size and shape as another, it's __________. 18. Angle with more than a 90° angle, and less than a 180° angle. 19. All points, between two given points. 20. Connected by points, and extending out pass both.

Down 2. Starting at one point, and extending infinitely in one direction. 3. A 180° angle. 4. Formed at the intersection of two lines. 5. Two coplanar lines that do not intersect. 6. When two segments are the same. 8. A straight line, that goes from left to right, like the X axis. 10. A straight line, that goes from top to bottom, like the Y axis. 11. Angle that measures less than 90° 14. Plane figure that all sides are line segments. 17. Two rays sharing a common end point.