The second law of vector addition is triangle law, which says that if we take 
and 
as two vectors acting at point O as shown in figure, then the resultant of vector is get by taking 
and 
as adjecent sides of a triangle and the 3rd side of the triangle as the resultant, then if θ is angle between 
and 
then.
(i) If the magnitude of both the vector 
& 
is A,then the resultant will have magnitude–
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Ans
(i)
Sol. 2A cos θ /2
(ii)
Sol. θ /2
(iii)
Sol. Equilateral triangle
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