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Across
  1. 1. Figures that have the same shape but not necessarily the same size.
  2. 4. Two nonadjacent angles formed by intersecting lines or segments. Also called opposite angles.
  3. 7. A transformation that turns a figure about a fixed point through a given angle and a given direction.
  4. 9. Comparison of two quantities by division and may be written as r/s, r:s, or r to s. Ray: A ray begins at a point and goes on forever in one direction.
  5. 11. Angle of a Polygon an angle that forms a linear pair with one of the angles of the polygon.
  6. 12. Having the same size, shape and measure. Two figures are congruent if all of their corresponding measures are equal. Congruent Figures: Figures that have the same size and shape.
  7. 14. Pairs of angles formed when a third line (a transversal) crosses two other lines. These angles are on the same side of the transversal and are outside the other two lines. When the two other lines are parallel, same-side exterior angles are supplementary.
  8. 18. Transformation that changes the size of a figure, but not the shape.
  9. 19. Line A line that is the perpendicular bisector of the segment with endpoints at a pre-image point and the image of that point after a reflection.
  10. 20. Interior Angles of a Triangle the two angles non-adjacent to the exterior angle.
  11. 22. Angles Two angles whose sum is 90 degrees.
  12. 26. The mapping, or movement, of all the points of a figure in a plane according to a common operation. Translation: A transformation that "slides" each point of a figure the same distance in the same direction Transversal: A line that crosses two or more lines.
  13. 27. The point of concurrency of the medians of a triangle.
  14. 28. One of the basic undefined terms of geometry. Traditionally thought of as going on forever in all directions (in two-dimensions) and is flat (i.e., it has no thickness).
  15. 29. Two lines that do not lie in the same plane (therefore, they cannot be parallel or intersect).
  16. 31. Lines Two lines are perpendicular if they intersect at a right angle.
  17. 32. The ratio of any two corresponding lengths of the sides of two similar figures.
  18. 33. of each Interior Angle of a Regular n-gon 180*(n 2)
  19. 34. The point of concurrency of the altitudes of a triangle.
  20. 35. Two equivalent linear equations overlap when graphed.
  21. 36. Angles are created by two distinct rays that share a common endpoint (also known as a vertex). ABC or B denote angles with vertex B.
Down
  1. 2. The point of concurrency of the bisectors of the angles of a triangle.
  2. 3. The points at an end of a line segment
  3. 5. Angles in the same plane that have a common vertex and a common side, but no common interior points.
  4. 6. An equation which states that two ratios are equal.
  5. 8. Alternate interior angles are pairs of angles formed when a third line (a transversal) crosses two other lines. These angles are on opposite sides of the transversal and are in between the other two lines. When the two other lines are parallel, the alternate interior angles are equal.
  6. 10. One of the basic undefined terms of geometry. Traditionally thought of as having no length, width, or thickness, and often a dot is used to represent it.
  7. 13. The point of concurrency of the perpendicular bisectors of the sides of a triangle.
  8. 14. Two angles whose sum is 180 degrees.
  9. 15. The property of a polygon whose sides are all congruent.
  10. 16. A polygon that is both equilateral and equiangular.
  11. 17. Segment or Segment The part of a line between two points on the line. AB denotes a line segment between the points A and B. Linear Pair: Adjacent, supplementary angles. Excluding their common side, a linear pair forms a straight line.
  12. 21. The property of a polygon whose angles are all congruent.
  13. 23. Lines Two lines in a plane that cross each other. Unless two lines are coincidental, parallel, or skew, they will intersect at one point. Intersection: The point at which two or more lines intersect or cross.
  14. 24. Lines Two lines are parallel if they lie in the same plane and they do not intersect.
  15. 25. Sides that have the same relative positions in geometric figures
  16. 30. A bisector divides a segment or angle into two equal parts.