Click and drag at the head and tail of blue vectors to change the magnitude and direction of the vectors.[br][br]Click and drag at the blue vectors to move the vectors.[br][br]To move the red vector, click and drag at the vector head.[br][br][br][b]The red vector is always the resultant of the two blue vectors.[/b]

1. Arrange the blue vectors such that the tail of one vector is touching the head of another.[br][br]2. Drag the red vector such that it forms a triangle together with the other blue vectors.[br][br]3. Repeat steps 1 and 2 using different blue vectors. Is it always possible to form a triangle?