Question 304887
<pre><font size = 4 color = "indigo"><b>
We start with the green radius vector (line segment) 
in this 0° position,

{{{drawing(400,400,-10,10,-10,10,
locate(9.6,0,x),  locate(2.5,1,"0°"), locate(.2,9.9,y),
red(line(-10,0,10,0)), red(line(0,-10,0,10)),
green(line(0,0,5,0))

 )}}}

Then we rotate the green vector around counter-clockwise
through 270°. The green arc (curved arrow) below shows the 
rotation of 270° counterclockwise of the green vector 
(line segment) from its initial position pointing rightward 
along the positive x-axis:
 
{{{drawing(400,400,-10,10,-10,10,
locate(9.6,0,x), locate(.2,9.9,y),
red(line(-10,0,10,0)), red(line(0,-10,0,10)),
green(line(0,0,0,-5)), green(arc(0,0,5,-5,0,270)),
green(line(-.5,-2.2,0,-2.5)), green(line(-.5,-2.8,0,-2.5)),
locate(-3,3,"270°")

 )}}}


Edwin</pre>