straight line and parabola
straight line and circle
circle and straight line
circle and parabola
The body centrode rolls on the space centrode.
The space centrode rolls on the body centrode.
Both body and space centrodes may role on each other.
The body centrode never touches space centrode.
zero
maximum
minimum
varying
constant
(i) and (iii)
(i) and (iv)
(ii) and (iii)
(ii) and (iv)