9.5.2

278 • CHAPTER 7
OBJECTS MENU • SPLINES • 279
R = 2, a = 2. R = 2, a = 1. R = 2, a = 4.
With the basic Epicycloid, the observed point P (that forms the curve) is on the radius of the outer
circle (a = r). With the shortened Epicycloid, it is on the inside of the outer circle (a < r), and with
the extended Epicycloid it is outside (a > r). The examples below illustrate some of the curves that
are possible.
R = 4, r = 2, a = 2. R = 3, r = 1, a = 1. R = 4, r = 1, a = 1.
R = 4, r = 3, a = 3. R = 8, r = 2, a = 1. R = 10, r = 2, a = 5.
R = 2, r = 3, a = 4.