  Using our interferometric observations of seven classical Cepheids reported
in Kervella et al. (2003, Paper I), complemented by previously existing
measurements, we derive new calibrations of the Cepheids Period-Radius (P-R)
and Period-Luminosity (P-L) relations. We obtain a P-R relation of log R =
[0.767 +/- 0.009] log P + [1.091 +/- 0.011], only 1 sigma away from the
relation obtained by Gieren et al. (1998). We therefore confirm their P-R
relation at a level of Delta(log R) = +/- 0.02. We also derive an original
calibration of the P-L relation, assuming the slopes derived by Gieren et al.
(1998) from LMC Cepheids, alpha_K = -3.267 +/- 0.042 and alpha_V = -2.769 +/-
0.073. With a P-L relation of the form M = alpha (log P - 1) + beta, we obtain
log P = 1 reference points of beta(K) = -5.904 +/- 0.063 and beta(V) = -4.209
+/- 0.075. Our calibration in the V band is statistically identical to the
geometrical result of Lanoix et al. (1999).
