The "vector triangle" illustrates the "dot product" of two vectors, represented as sides of a triangle and the enclosed angle. This can be calculated using the law of cosines. (see link)
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no because triangle only contain three vectors and if many vector are added then they cant form a triangle
If three vectors form a triangle , their vector sum is zero.
We use the dot product cos and in vector we use the vector product sin because of the trigonometric triangle.
Consider an equilateral triangle. If each vector started at the center of the triangle and went through a different vertex than the other two vectors then they would cancel. I believe in order for them to add to a null vector they must be co-planer.
ya they just accidentally said law of vectors instead.