ECN Forum Forums Technical Discussion Electrical Theory and Applications 1.732 (square root of 3) where did this come from?

There are alot of 3-phase formulas that involve multiplying the line-to-line voltage by 1.732. I realize this is the square root of 3, but why is this step necessary. I think it is because of the 3 windings being out of phase angle, but I would like a layman's explaination, please.

TIA

Rick Miell