If A is the area of the foundation of a retaining wall carrying a load W and retaining earth of weight 'w' per unit volume, the minimum depth (h) of the foundation from the free surface of the earth, is

h = √(W/Aw) [(1 - sin φ)/(1 + sin φ)]²

h = (W/Aw) [(1 - sin φ)/(1 + sin φ)]

h = (W/Aw) [(1 + sin φ)/(1 + sin φ)]

h = (W/Aw) [(1 - sin φ)/(1 + sin φ)]²

If A is the area of the foundation of a retaining wall carrying a loa

1.	If A is the area of the foundation of a retaining wall carrying a load W and retaining earth of weight 'w' per unit volume, the minimum depth (h) of the foundation from the free surface of the earth, is
A.	h = (W/Aw) [(1 - sin φ)/(1 + sin φ)]
B.	h = (W/Aw) [(1 + sin φ)/(1 + sin φ)]
C.	h = (W/Aw) [(1 - sin φ)/(1 + sin φ)]²
D.	h = √(W/Aw) [(1 - sin φ)/(1 + sin φ)]²
Answer» D. h = √(W/Aw) [(1 - sin φ)/(1 + sin φ)]²