Geometry crossword

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Across
  1. 5. the angle between a side of a polygon and an extended adjacent side
  2. 9. a plane figure with five straight sides and five angles.
  3. 11. a plane figure with four straight sides and four right angles, especially one with unequal adjacent sides, in contrast to a square.
  4. 12. a plane figure with four equal straight sides and four right angles.
  5. 13. a plane figure with eight straight sides and eight angles.
  6. 14. closed shape with straight sides.
  7. 15. a plane figure with ten straight sides and angles.
Down
  1. 1. a plane figure with at least three straight sides and angles, and typically five or more.
  2. 2. a four-sided plane rectilinear figure with opposite sides parallel.
  3. 3. the angle between adjacent sides of a rectilinear figure.
  4. 4. a quadrilateral with only one pair of parallel sides.
  5. 6. a parallelogram with opposite equal acute angles, opposite equal obtuse angles, and four equal sides.
  6. 7. a plane figure with seven straight sides and angles.
  7. 8. a plane figure with nine straight sides and nine angles.
  8. 10. a plane figure with six straight sides and angles.