Geometry

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Across
  1. 2. a quadrilateral with both pairs of opposite sides parallel and all sides the same length
  2. 4. a round plane figure whose boundary consists of points equidistant from a fixed point
  3. 5. the action of rotating around an axis or center
  4. 6. lying in the same straight line.
  5. 8. the quality of being made up of exactly similar parts facing each other or around an axis
  6. 9. An image or shape as it would be seen in a mirror.
Down
  1. 1. a 3-sided polygon
  2. 3. moving a shape without rotating or flipping it
  3. 4. identical in form; coinciding exactly when superimposed.
  4. 7. the longest side of a right triangle, opposite the right angle