If they are not coplanar, you would need at least four forces to get a net force (resultant force) of zero.
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Assuming you want non-zero vectors, two opposing vectors will give a resultant of zero.
a resultant vector not only the resultant of two or three vector. it is the resultant direction of two or many vectors.(let us push an object with same force in opposite direction the resultant is zero and if we push in same direction the force will double.if we pull a object with same force in x and y direction the resultant force in 45 degrees to x axis)
no because triangle only contain three vectors and if many vector are added then they cant form a triangle
12 vectors, unless it is a parallelogram (13 if you include the null vector). If the quadrilateral is a parallelogram there will be two fewer.
The resultant will not be a polygon. 2700 degrees = 180 degrees which means it will be a straight line.