Dipole moment question.

consider the molecule H3C-S-S-CH3. what is c-s-s bond angle do you expect? does the molecule have a dipole moment?
Please explain the dipole moment part of this question. why does the molecule not have a dipole moment?

The C-S-S bond angle should be slightly less than 109 and closer to 107

The molecule has no net dipole moment because none of the bonds in the molecule are polar.