Area of Quadrilaterals

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Across
  1. 2. A closed 2D shape with straight sides
  2. 3. Lines that are always the same distance apart and never meet
  3. 6. A quadrilateral with one pair of parallel sides
  4. 7. A mathematical rule to calculate area
  5. 10. A quadrilateral with two pairs of adjacent equal sides
  6. 11. The vertical distance from base to top
  7. 12. A four-sided figure with opposite sides equal and right angles
  8. 14. A three-sided polygon
Down
  1. 1. A quadrilateral with all sides equal and opposite angles equal
  2. 3. A quadrilateral with opposite sides parallel and equal
  3. 4. The space inside a shape
  4. 5. A polygon with four sides
  5. 8. The total distance around a shape
  6. 9. A shape with four equal sides and four right angles
  7. 13. The bottom length of a triangle or parallelogram