Area and Perimeter

123456789
Across
  1. 5. The other side of a square other than length
  2. 6. The main operation used for area
  3. 7. This quadrilateral has four congruent sides but no right angles
  4. 8. The other side of a square other than width
  5. 9. The only shape on the front cover that doesn't have any sides
Down
  1. 1. The main operation used for perimeter
  2. 2. The quadrilateral that has four right angles but NOT a square
  3. 3. This word goes before area answers
  4. 4. The default unit if a unit isn't specified