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Across 2. When the sum of two angles is 180 degrees 5. Common endpoint of an angle 6. An angle that measures 90 degrees 7. A part of a line or ray that goes from one point to another 9. Lines that do not intersect that are in different planes 10. Part of a line that has one endpoint and extends in one direction 12. Angles that are opposite and formed by two intersecting lines 14. Figures that have same shape and size 16. When the sum of two angles is 90 degrees 18. Angles that have a common vertex and a common side 19. A flat surface that extends forever

Down 1. Lines that do not intersect in the same plane 3. Lines formed when angles formed are 90 degrees 4. An angle that is greater than 0 degrees but less than 90 degrees 8. A line that intersects two or more lines 11. An angle that measures 180 degrees 13. An angle that is greater than 90 degrees but less than 180 degrees 15. An exact location usually represente as a dot 17. A straight path that extends in both directions 18. Formed by two rays with a common endpoint