Geometry Vocabulary

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Across
  1. 3. an angle that is less than 90 degrees
  2. 5. an angle that is 90 degrees
  3. 7. the theory that says a squared plus b squared equals c squared
  4. 9. line segments that cross each other
  5. 11. a quadrilateral plane figure having two parallel and two nonparallel sides
  6. 13. the set of all points in the plane that are a fixed distance from the center
  7. 14. an exact position or location on plane surface
  8. 18. sides that are the same length
  9. 19. angles that have the same measure
  10. 20. a half-infinite line
  11. 21. a straight, one-dimensional figure that extends endlessly
Down
  1. 1. two lines that intersect in a 90 degree angle
  2. 2. an angle that is larger than 90 degrees
  3. 4. a triangle with three different side lengths
  4. 6. the longest side of a right triangle
  5. 8. a six-sided plane figure
  6. 10. a triangle that has two sides with equal lengths
  7. 12. a polygon with four sides
  8. 15. an eight-sided plane figure
  9. 16. two lines that will never intersect
  10. 17. the common endpoint of the sides of an angle