1 Point (navigation):1 Point (navigation) is 1 turn/32 or 1/8 of a right angle or 11.25° or 12.5 grad. In radians (SI unit) 1 point is π/16 rad.
Circle:A circle is a simple closed shape. It is the set of all points in a plane that are at a given distance from a given point, the centre; equivalently it is the curve traced out by a point that moves so that its distance from a given point is constant. The distance between any of the points and the centre is called the radius.