Sulfur trioxide (triangular planar) formed by double covalent bonds, is a compound that presents polar bonds although the dipole moments associated with each bond are canceled by symmetry, resulting in apolar molecules.
It is a nonpolar molecule that contains one sulfur atom bonded to three oxygen atoms.
Therefore, we can conclude that SO3 is a nonpolar molecule due to its geometry (trigonal planar) and the absence of a lone pair of electrons.
Learn more about types of bonding present in the molecule SO3 here: https://brainly.com/question/17356017