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Question
According to Lami’s theorem:
Options:
A .  The three forces must be equal
B .  The three forces must be at 120° to each other
C .  The three forces must be in equilibrium
D .  If the three forces acting at a point are in equilibrium, then each force is proportional to the sine of the angle between the other two
E .  None of these
Answer: Option D

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