Geometry

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Across
  1. 3. These lines never meet.
  2. 5. A 10-sided polygon
  3. 6. The point at which two adjacent sides of a polygon meet.
  4. 7. A special quadrilateral with opposite sides equal.
Down
  1. 1. A simple closed shape bound by a curved line.
  2. 2. A 3-sided polygon
  3. 4. It goes endlessly in both directions
  4. 5. It divides the circle into two equal parts