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by Platinum
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Define a vector

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A vector is represented by a directed line segment. It has an initial point $A$ and a terminal point $B$. It has a length and a direction indicated by the arrow.
 

Note : A scalar has magnitude or size only, i.e., no direction, e.g. mass, speed, time, real number, ... In engineering, vectors are used for forces, velocity, weight, ...

by Platinum
(119,140 points)

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You may choose the same option for matching more than once. Read through the following proof and match the lines with the reasons given below.

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You may choose the same option for matching more than once. Read through the following proof and match the lines with the reasons given below.
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You may choose the same option for matching more than once. Read through the following proof and spot an error or not in the lines $L 1$ to $L 5$.

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You may choose the same option for matching more than once. Read through the following proof and spot an error or not in the lines $L 1$ to $L 5$.

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