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{x where not(&':)" "=x} / 23 chars and fast f[not(&':)" "=] / as a projection

You don't need any of the midpoint calculation, the answer in radians is atan ab%bc

It's not very clear what you're trying to do, I'd suggest reading about queries more (https://code.kx.com/q4m3/9_Queries_q-sql/) and maybe looking at other courses (https://kx.com/academy/) for more general help. It is generally better to try for a w...

Is it possible to have an example? Notes can map to multiple spots, so it is unclear.