Hi I've probably got a very basic question but I'm really confused about this. If I have a vector that starts at the origin and points to say (3,-3) so the 4th quadrant, and I am wanting to split apart my vector into its x and y components, are we typically measuring the angle with respect to the x or y axis? I'm confused because there would be two angles possible, one from the x axis and the other from the y axis and I'm wondering which one I should be measuring the angle from. Thank you!
I've got three vectors which add up to an equilateral triangle and I'm trying to show that their x and y components will add up to zero because I believe I am using the wrong angles.