Why bcl3 nonpolar?

Boron trichloride (BCl3) is nonpolar because of its symmetrical trigonal planar molecular geometry. Although the B-Cl bonds are polar due to the difference in electronegativity between boron and chlorine, the symmetry of the molecule causes the dipole moments to cancel each other out. As a result, there is no net dipole moment, making BCl3 a nonpolar molecule.