Area of Rectangles and Parallelogram

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Across
  1. 3. Used to show leftover numbers using a point
  2. 4. A rectangle with 4 equal sides
  3. 5. Smallest unit in the metric unit
  4. 7. A shape with 2 pairs of parallel sides
  5. 10. The operation used to find area
  6. 11. The bottom of a shape
  7. 16. A 4 sided shape
  8. 17. The length from the top to the bottom
  9. 18. Unit made of 12 inches
Down
  1. 1. The space outside a shape
  2. 2. A type of math that involves shapes
  3. 6. Unit made of 10 millimeters
  4. 8. The space inside a shape
  5. 9. The smallest unit in the imperial unit
  6. 12. Unit made of 5280 feet
  7. 13. Used to show leftover numbers in simplified form
  8. 14. A unit used to show area
  9. 15. Unit made of 3 feet