For the figure
2-19

  • A
    $\overrightarrow A + \overrightarrow B = \overrightarrow C $
  • B
    $\overrightarrow B + \overrightarrow C = \overrightarrow A $
  • C
    $\overrightarrow C + \overrightarrow A = \overrightarrow B $
  • D
    $\overrightarrow A + \overrightarrow B + \overrightarrow C = 0$

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