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Depth of foundation by Rankin's formula is

Ah = p/w [(1 - sinθ)/ (1 + sinθ)]²

Bh = w/p [(1 - sinθ)/ (1 + sinθ)]²

Ch = p/w [(1 + sinθ)/ (1 - sinθ)]²

Dh = p/w [(1 - sinθ)/ (1 + sinθ)]

Answer:

A. h = p/w [(1 - sinθ)/ (1 + sinθ)]²


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