Rigid Transformations and Congruence

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Across
  1. 4. The new figure (or point) that results from applying a transformation to the original (preimage).
  2. 7. Interior Angles, When two parallel lines are cut by a transversal, the pairs of angles that lie between (interior to) the two lines and on opposite (alternate) sides of the transversal.
  3. 9. The direction in which the hands of a clock move; a rotation in this direction is called a clockwise rotation.
  4. 11. A rigid transformation which “flips” a figure over a line (the line of reflection), producing a mirror image.
  5. 13. Angles, Two angles whose measures sum to 180°.
  6. 16. A line that intersects two (or more) lines at distinct points, often used when discussing parallel lines and angles.
  7. 18. The same angle in two different intersections.
  8. 20. of Reflection, The line over which a figure is reflected; it’s the “mirror line.”
  9. 21. The length of the straight-line segment between two points. (Used when discussing preservation of lengths under rigid transformations.)
  10. 22. A numerical amount used to quantify size, e.g. length of a segment or measure of an angle.
Down
  1. 1. The direction opposite the hands of a clock; a rotation in this direction is called a counterclockwise rotation.
  2. 2. Two lines in a plane that never meet; they remain the same distance apart everywhere.
  3. 3. The point where two lines meet.
  4. 5. The horizontal axis in a coordinate plane (used when working with coordinate transformations).
  5. 6. In contexts of angles: angles that share a vertex and are nonadjacent (e.g. vertical angles).
  6. 8. A transformation that turns a figure about a center of rotation by a given angle and direction (clockwise/counterclockwise).
  7. 10. The vertical axis in a coordinate plane.
  8. 12. Two figures are congruent if one can be mapped exactly onto the other by a sequence of rigid transformations (i.e. same size and shape).
  9. 14. Angle, An angle of 180° (a straight line).
  10. 15. A transformation that “slides” every point of a figure the same distance in the same direction.
  11. 17. Transformation, A transformation that preserves lengths and angle measures (i.e., does not distort).
  12. 19. of Rotation, The amount (in degrees) a figure is rotated about a center of rotation.