Q.

A body is in equilibrium under the action of three coplanar forces P, Q and R are shown in the figure. Select the correct statement.

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a

Psinα = Qsinβ = Rsinγ

b

Pcosα = Qcosβ = Rcosγ

c

Ptanα = Qtanβ = Rtanγ

d

Psinβ = Qsin γ = Rsinα

answer is A.

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Detailed Solution

According to Lami's theoremPsin α = Qsinβ = Rsin γ
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