Answer: Think of each polar bond in a molecule as a little arrow pointing from positive to negative. So, the geometry of the molecule determines the direction that the bond dipole vectors point. The polarity of the molecule results from adding up all these individual bond dipoles.
Molecular shape affects polarity because if the molecule is symmetric, the effects of polarity will cancel out.
Many times, it is common observation that molecules that posses polar bonds are nonpolar. This is because, overall dipole moment of a molecule is a vector quantity and depends on the shape of the molecule.
If a molecule is symmetric such as BF3 and CO2 , the dipoles cancel out and the molecule is nonpolar irrespective of the presence of polar bonds.
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