Tools Of Geometry

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Across
  1. 2. two angles whose sides form two pairs of opposite rays
  2. 6. to cut into two congruent pieces
  3. 9. segments that have the same length
  4. 10. two rays with a common endpoint
  5. 11. given points (x1, y1) and (x2, y2), find the average of the x values and the average of the y values
  6. 12. a geometric tool used to draw circles, and parts of circles called arcs
  7. 14. the absolute value of the difference of the coordinates, also called the length
  8. 15. flat surface that extends without end and has no thickness, contains infinitely many lines, named with three non-collinear points
  9. 17. if three points A, B, and C are collinear and B is between A and C, then AB + BC = AC, "part + part = whole"
  10. 20. two lines that intersect to form a right angle
  11. 21. a line, segment, or ray that is perpendicular to a segment at its midpoint
  12. 26. straight path that extends in two opposite directions without end and has no thickness or width, contains infinitely many points
  13. 27. two coplanar angles with a common side, a common vertex, and no common interior points
  14. 30. a ruler with no markings on it
  15. 31. angles with exactly the same measure
  16. 32. a pair of adjacent angles whose noncom sides are opposite rays, always adjacent and supplementary
  17. 33. a point, line, ray, or other segment that intersects a segment at its midpoint
  18. 35. an accepted statement of fact, also called an axiom
  19. 36. an angle whose measure is between 0 and 90 degrees
  20. 37. indicates a location and has no size
  21. 38. an angle whose measure is exactly 90 degrees, indicated with a "box" in the corner
Down
  1. 1. two rays that share a common endpoint and form a line
  2. 2. the common endpoint of two rays, always the middle letter when naming angles with three points
  3. 3. part of a line that consists of one endpoint and all the points of the line on one side of the endpoint
  4. 4. two angles whose measures have a sum of 90 degrees, they may or may not be adjacent
  5. 5. that lie in the same line
  6. 7. if point B is on the interior of angle AOC, then the m<AOB + m<BOC = m<AOC, "part + part = whole"
  7. 8. given points (x1, y1) and (x2, y2), find the square root of (x2-x1) ²+ (y2-y1) ²
  8. 11. a point that divides a segment into two congruent halves
  9. 13. measurable part of a line that consists of two endpoints and all the points between them
  10. 16. two angles whose measures have a sum of 180 degrees, they may or may not be adjacent
  11. 18. a geometric figure drawn using a straightedge and a compass
  12. 19. meeting to form a right angle
  13. 22. erms points, lines, and planes are __________ because they cannot be made from any other figures, the "building blocks of geometry"
  14. 23. 1/360 of a circle, used to measure angles
  15. 24. the set of points that figures have in common
  16. 25. a ray that divides an angle into two congruent angles
  17. 28. points and lines that lie in the same the plane
  18. 29. an angle whose measure is exactly 180 degrees
  19. 34. an angle whose measure is between 90 and 180 degrees