\sin(acb) = \frac{ab}{bc} \\ ab = \sin(acb) \times bc \\ ab = 0.4 \times 7 \\ ab = 2.8cm[/tex]
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\sin(acb) = \frac{ab}{bc} \\ ab = \sin(acb) \times bc \\ ab = 0.4 \times 7 \\ ab = 2.8cm[/tex]