"If two vector quantities are represented by two adjacent sides or a parallelogram then the diagonal of parallelogram will be equal to the resultant of these two vectors."
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No, it is simpler than that. Simply add the two magnitudes. The direction will be the same as the parallel vectors.
yes a parallelogram is a parallelogram
because both lines are paralle so it is a parallelogram
Perpendicular means that the angle between the two vectors is 90 degrees - a right angle. If you have the vectors as components, just take the dot product - if the dot product is zero, that means either that the vectors are perpendicular, or that one of the vectors has a magnitude of zero.
A square is always a parallelogram. Every square is a parallelogram.