The following method is called the
parallelogram rule of vector addition:
Let there be vectors AB and AC for which the beginning of the vector coincides, and the ends do not coincide.
![Addition of vectors. Parallelogram rule](/th/25/blogs/id3404/1_slogvecpravparal2.jpg)
We complete this angle to a parallelogram, so AC = BD and AB = CD.
![Addition of vectors. Parallelogram rule](/th/25/blogs/id3404/2_slogvecpravparal3.jpg)
Then AB + BD = AD, and since BD = AC, then AB + AC = AD
![Addition of vectors. Parallelogram rule](/th/25/blogs/id3404/3_slogvecpravparal4.jpg)
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Planometry
Terms: Planometry