Is trigonal pyramidal non-polar?
There is at least one example of a polar pyramidal molecule and that would be ammonia, NH3. N is more electronegative than H so the polar bonds are directed toward the N which is also where the unshared pair is. Remember that the dipoles behave like vectors, meaning they have component vectors, and while the planar (x and y) components of the three NH bonds cancel, the vertical (z) components add.
