Geometry Introduction Vocabulary Crossword

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Across
  1. 2. a number that measures its "steepness" of a line, usually denoted by the letter m. It is the change in y for a unit change in x along the line
  2. 3. Two angles that are adjacent (share a leg) and supplementary (add up to 180°)
  3. 5. An angle whose measure is less than 90°
  4. 7. lines are considered ________ if they intersect at right angles (90°) or have opposite reciprocal slopes
  5. 8. Two angles that add up to 90°
  6. 11. lines are considered ________ if they lie in the same plane, are the same distance apart over their entire length, and have the same slope
  7. 14. An angle whose measure is exactly 90°
  8. 18. An angle whose measure is greater than 90° and less than 180°
  9. 19. A portion of a line which starts at a point and goes off in a particular direction to infinity
  10. 20. The common endpoint of two or more rays or line segments
Down
  1. 1. Two angles that add up to 180°
  2. 4. A flat surface that is infinitely large and with zero thickness
  3. 6. equal in size and shape
  4. 9. A point on a line segment that divides it into two equal parts
  5. 10. A pair of non-adjacent angles formed by the intersection of two straight lines
  6. 12. A geometrical object that is straight, infinitely long and infinitely thin
  7. 13. A line, ray, or segment which cuts an angle or another line segment into two equal(congruent) parts
  8. 15. A straight line which links two points without extending beyond them
  9. 16. A shape, formed by two lines or rays diverging from a common point (the vertex)
  10. 17. An exact position or location on a surface