geometry

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Across
  1. 4. a figure formed by two rays that have the same endpoint
  2. 6. an adjective of angles whose measures have the sum of 180
  3. 7. a statement that contains the words "if and only if"
  4. 8. a quadrilateral with both pairs of opposite sides parallel
  5. 12. an angle with measure between 90 and 180 degrees
  6. 13. a line that intersects two or more coplanar lines in different points
  7. 14. a quadrilateral with four right angles
  8. 16. two angles whose sides form two pairs of opposite rays
  9. 17. the figure formed by three segments joining three noncollinear points
  10. 18. two angles in a plane that have a common vertex and a common side but no common interior points
  11. 20. lines that are not coplanar
Down
  1. 1. two lines that intersect to form right angles
  2. 2. a statement accepted without proof
  3. 3. an angle with measure of 90 degrees
  4. 5. an angle with measure of 180 degrees
  5. 9. an angle with measure between 0 and 90 degrees
  6. 10. an adjective of angles whose measures have the sum of 90
  7. 11. an example used to prove that an if-then statement is false
  8. 15. a statement that can be proved
  9. 19. the set of all points