Check: wikiHow Plot-Polar-Coordinates
Made things a lot easier.....
a "circle graph" is also a polar graph, it's used to graph polar coordinates.
You do not have to. You could use polar coordinates, if you prefer.
You get a graph based on polar coordinates rather than Cartesian coordinates. Some shapes have simpler equations in polar coordinates: for example, a circle with centre at the origin and radius r, is simple R = r. A straight line through the origin and gradient (slope) m is tan(q) = m.
True
absolute relative and polar coordinates definition
If the polar coordinates of a point P are (r,a) then the rectangular coordinates of P are x = rcos(a) and y = rsin(a).
The point whose Cartesian coordinates are (2, 0) has the polar coordinates R = 2, Θ = 0 .
The point whose Cartesian coordinates are (-3, -3) has the polar coordinates R = 3 sqrt(2), Θ = -0.75pi.
(-4,0)
polar
pole
(-6,6)