A vector quantity is a quantity that needs to tell the direction and size. An example of a vector quantity, such as displacement, speed, etc., if we tell just size without directions.The arrow represents the sign of vector. Hua Lu arrow direction instead of that size. The length of the arrow instead of volume. Combining vector polygon including arrowhead water tail on the arrow, using the method of a quadrilateral with parallel, or the tail tail arrow arrow.How to calculate, but this method can answer only the size.
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