You can
put this solution on YOUR website!When looking at a vector, you need to look at the the 'size' or amplitude of the the vector. A vector has an x component and a y component (or in your case, an i and a j).
Look at the vector like a hypotenuse of a right triangle where the two legs are given in terms of i an j.
You know that in a right triangle,
Thus, in this case
Got it?
