Multiply half its length by 2
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The length of the arrow signifies the magnitude or size of the vector.
A vector is like an arrow. It points in the relevant direction and its length is a measure of the distance.
Velocity.
Yes, but only if the size (length) of the arrow is related to some scale.
No. A centimeter is a measure of length. Any unit of measure that has a meter in it is a measure of length. For example, millimeters, meters, kilometers are all units of measure for length.