Quadrilateral, Paralellogram

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Across
  1. 2. A length between two adjacent vertices of a polygon
  2. 4. the full technical term for any 4-sided polygon.
Down
  1. 1. think “90°”
  2. 3. what's the area of a parallelogram?
  3. 5. think measurement abbreviations/words (e.g., metre, unit).
  4. 6. synonyms: same, identical, ______.