dipole moment: SO2 and SO3 | Polar | Non-Polar

This video explains the dipole moment of sulphur dioxide and sulphur trioxide. From the dipole moment value we also can predict the molecule is polar or non polar.

[AdarshZW]

Mam how can so3's dipole moments will cancel each other on upside is only 1(double bond) and on downside is 2 (double bond) so downside dipole moment should be more than upside dipole moment?

[zainubhayat-jtoi]

Why direction of lone pair dipole is upward