Question 1097817
<pre><b>
Below is 51°.  The arc swings counter-clockwise from the
right side of the x-axis

{{{drawing(400,400,-3,3,-3,3,

graph(400,400,-3,3,-3,3), 
line(0,0,10cos(51*pi/180),10sin(51*pi/180)),
arc(0,0,4,-4,0,51)  )}}}

Below is 51°+360°=411° which is coterminal with 51°,
the arc swings counter-clockwise from the right side
of the x-axis.

{{{drawing(400,400,-3,3,-3,3,

graph(400,400,-3,3,-3,3), arc(-.25,0,4.5,-4.5,0,180),
line(0,0,10cos(51*pi/180),10sin(51*pi/180)),
arc(0,0,5,-5,180,411)  )}}}

Below is 51°-360°=-309° which is coterminal with 51°.
the arc swings clockwise from the right side
of the x-axis.

{{{drawing(400,400,-3,3,-3,3,

graph(400,400,-3,3,-3,3), 
line(0,0,10cos(51*pi/180),10sin(51*pi/180)),
arc(0,0,4,-4,51,360)  )}}}

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Below is 197°.  The arc swings counter-clockwise from the
right side of the x-axis

{{{drawing(400,400,-3,3,-3,3,

graph(400,400,-3,3,-3,3), 
line(0,0,10cos(197*pi/180),10sin(197*pi/180)),
arc(0,0,4,-4,0,197)  )}}}

Below is 197°+360°=557° which is coterminal with 197°,
the arc swings counterclockwise from the right side
of the x-axis.

{{{drawing(400,400,-3,3,-3,3,

graph(400,400,-3,3,-3,3), arc(-.25,0,4.5,-4.5,197,360),
arc(0,0,4,-4,0,197),
line(0,0,10cos(197*pi/180),10sin(197*pi/180)),
arc(0,0,5,-5,0,197)  )}}}

Below is 197°-360°=-163° which is coterminal with 197°.
the arc swings clockwise from the right side
of the x-axis.

{{{drawing(400,400,-3,3,-3,3,

graph(400,400,-3,3,-3,3), 
line(0,0,10cos(197*pi/180),10sin(197*pi/180)),
arc(0,0,4,-4,197,360)  )}}}

Edwin</pre>