  It happens that $s^2$ and $\hat s^2$ are equal with 0.1% accuracy, though
they are split by radiative corrections and a natural estimate for their
difference is 1%. This degeneracy occurs only for $m_t$ value close to
$170\GeV$, so no deep physical reason can be attributed to it. However, another
puzzle of the Standard Model, the degeneracy of $s_\Eff^2$ and $s^2$, is not
independent of the previous one since a good physical reason exists for
$s_\Eff^2$ and $\hat s^2$ degeneracy. We present explicit formulas which relate
these three angles.
