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sqdancefan
The TOA part of SOH CAH TOA tells you ...
  Tangent = Opposite/Adjacent

When applied to the triangle of shadow and person, this means
  tan(24°) = (1.82 m)/(shadow length)
This can be rearranged to
  (shadow length) = (1.82 m)/tan(24°) ≈ 4.09 m

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