Across
- 6. a figures whose measure is 360 degrees
- 8. two angles that form a line
- 9. points on the same line
- 10. angles on opposite sides when two lines intersect
- 11. two or more non-coplanar lines that do not intersect
- 12. same side interior angles
- 13. alternate exterior angles
Down
- 1. within the same plane
- 2. two angles whose sum is 90 degrees
- 3. two angles whose sum is 180 degrees
- 4. two coplanar lines that never intersect.
- 5. alternate interior angles
- 7. angles that are in the same position when parallel lines are cut by a transversal
- 8. a straight figure that goes on forever and has 180 degrees
- 11. same side exterior angles