Basic Vocabulary

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Across
  1. 4. on the same plane
  2. 5. on the same line
  3. 6. a piece of a line with two distinct endpoints
  4. 9. two angles which add to 180 degrees
  5. 13. a line or line segment which intersects a line segment at a 90 degree angle and divides the line segment into two equal parts
  6. 16. the same distance
  7. 17. a pair of adjacent supplementary angles
  8. 18. the point of origin of the two sides of an angle
  9. 19. two angles which share a common side
Down
  1. 1. two nonadjacent angles which are formed by intersecting lines
  2. 2. intersecting at a 90 degree angle
  3. 3. the point of intersection of the three angle bisectors in a triangle
  4. 5. two angles which add to 90 degrees
  5. 7. the point of intersection of the three perpendicular bisectors in a triangle
  6. 8. two rays with a common initial point but opposing directions
  7. 10. a piece of a line with one distinct endpoint
  8. 11. an angle which measures less than 90 degrees
  9. 12. an angle which measures 90 degrees
  10. 14. a ray which divides an angle into two equal parts
  11. 15. an angle which measure more than 90 degrees
  12. 20. Geometrically Equal in terms of both size and shape