
  How Triangle Law**and **Parallelogram law of addition of Vectors are different?Ain't they.


They are not different.

They are the same thing. There is only one real law which is the head to tail rule. When adding any number vectors put head to tail, head to tail, head to tail... until all the vectors are used up and then draw a line from the tail to the head and that is your resultant vector.

The parallelogram law is essentially just using the triangle law twice in a different order, and they both get the same answer because order does not matter I.E. $\vec A+ \vec B = \vec B + \vec A$.

Here shows the addition of three vectors, the "triangle" rule has been used twice in a row to get $\vec A+ \vec B + \vec C = \vec R$. If yo tried to use the parallelogram to get this answer the resulting diagram would be a mess of repeatedly writing the same vector and over.

Laws of addition of Vectors
In another question I asked about ways one might obfuscate the design of a system, to prevent unauthorized cloning. One suggestion was that IC manufacturers are often willing to put custom labels on their chips. The idea is interesting, but my quantities are low enough that this would not be cost-effective. How might one remove or otherwise render unreadable the labels on ICs?
