00:01
Okay, first step with these kind of questions, draw the vector.
00:04
Here are the axes, x and y.
00:07
Minus 3, minus 4 is going to be right here somewhere.
00:15
Here is minus 3, minus 4.
00:22
So, i want to find, let's draw this right angle here.
00:30
I want to find this angle alpha and the length r here.
00:35
So the r is from pythagoras.
00:37
It's a three, four, five triangle, basically, because here we know it's three squares, here is four squares, so r is five...