I'm learning vectors now and I have 2 questions.
How come this is true:
To me, this is not very intuitive. If I have a triangle, the sides do not add up to become the 3rd side as displayed but I'm guessing there is some other factor at play to make this a logical conclusion.
My other question is if there are any videos on khan academy or any sites like that covering this concept? I have searched on Khan but to no avail...He starts discussing vectors in linear algebra but I'm pretty sure this is taught before linear algebra.