If θ₁ and  θ₂ are the angles of elevation from A to the top and bottom of a vertically held rod of length S at B, the horizontal distance AB is
AS/(tanθ₁ + tanθ₂)
BS/( tanθ₂ - tanθ₁)
CS/(tanθ₁ * tanθ₂)
DS/(tanθ₁ - tanθ₂)

AS/(tanθ₁ + tanθ₂)
BS/( tanθ₂ - tanθ₁)
CS/(tanθ₁ * tanθ₂)
DS/(tanθ₁ - tanθ₂)
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