Find the area of rectangles and squares

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Across
  1. 3. Determining the size, length, quantity, or extent of something
  2. 6. A four sided flat shape with opposite sides equal and parallel
  3. 7. The amount of space in a 2D shape
  4. 10. A shape with three sides
Down
  1. 1. Used to count,measure,label, and calculate quantities
  2. 2. A shape with four equal sides
  3. 4. A reusable rule to show how different quantities are connected
  4. 5. The measurement of the distance between two points
  5. 8. The shape from side to side
  6. 9. A standard quantity