If p₁ and p₂ are mutually perpendicular principal stresses acting on a soil mass, the normal stress on any plane inclined at angle θ° to the principal plane carrying the principal stress p₁, is:

(p₁ + p₂)/2] + [(p₁ - p₂)/2] sin 2θ

(p₁ - p₂)/2] + [(p₁ + p₂)/2] sin 2θ

(p₁ - p₂)/2] + [(p₁ + p₂)/2] cos 2θ

(p₁ + p₂)/2] + [(p₁ - p₂)/2] cos 2θ

If p₁ and p₂ are mutually perpendicular principal stresses acting

1.	If p₁ and p₂ are mutually perpendicular principal stresses acting on a soil mass, the normal stress on any plane inclined at angle θ° to the principal plane carrying the principal stress p₁, is:
A.	(p₁ - p₂)/2] + [(p₁ + p₂)/2] sin 2θ
B.	(p₁ - p₂)/2] + [(p₁ + p₂)/2] cos 2θ
C.	(p₁ + p₂)/2] + [(p₁ - p₂)/2] cos 2θ
D.	(p₁ + p₂)/2] + [(p₁ - p₂)/2] sin 2θ
Answer» D. (p₁ + p₂)/2] + [(p₁ - p₂)/2] sin 2θ

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If p₁ and p₂ are mutually perpendicular principal stresses acting on a soil mass, the normal stress on any plane inclined at angle θ° to the principal plane carrying the principal stress p₁, is:

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