geometry

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Across
  1. 3. a line segment that joins two non-adjacent vertices of a polygon.
  2. 4. the point where two sides or edges meet.
  3. 5. lines that meet at a right angle.
  4. 6. a straight edge of a polygon.
  5. 7. an angle that is greater than 90 degrees but less than 180 degrees.
  6. 8. a flat surface that extends infinitely in all directions.
  7. 10. an angle that measures exactly 90 degrees.
  8. 11. a position in space with no size or shape.
Down
  1. 1. a polygon with four sides.
  2. 2. lines that never meet and are always the same distance apart.
  3. 6. when one half of a shape is the same as the other half.
  4. 9. an angle that is smaller than 90 degrees.