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      R_A_AP_AP1_fig1

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      Triangular array of billiard balls, five on each side and 15 in total.

      Billiard balls.
      Source: James Barker/Freedigitalphotos.net

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      A long box divided into eight square sections. Below it, a second box divided into five sqaure sections. Box long boxes measure 10 cm in length. 10

      R_A_AP_AP2_...

      Row of eight small squares matched to row of five large squares. Student response to questions comparing the areas, explaining reasoning.

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