do explain each and every step. and explain why u considered +or - sign for any vector...
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Let x be the distance of centre O of the equilateral triangle from each side.
Total torque about O is zero.
Torque anticlockwise.
In the given figure, F3x is clockwise so it it taken negative.
In the given figure, F1x and F2x are anticlockwise so it is taken positive.
Make it as equation and solve.
F1 + F2 - F3 = 0
=> F1 + F2 = F3.
Therefore the answer is Option(3).
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