week4(10/01)Further Geometric Properties of Cycloids
nephroid may be regarded as a catacaustic of the cardioid
cardioid may be regarded as a catacaustic of the circle
a pair of orthogonal cardioids sharing the same cusp
two cardioids sharing the same cusp
gear-tooth coupling among a deltoid, an astroid
two rotating cardioids meeting orthogonally
two rotating cardioids meeting tangentially
a rotating cardioid and a rotating nephroid meeting tangentially
a rotating cardioid and a rotating nephroid meeting tangentially
two orthogonal cardioids meeting on a deltoid
all the interesting epi- and hypocycloids
