[OpenLayers-Users] Point in parrallel with line formula

[newbie]

Dear All,
           Just say I got a pair of lat and long p1 and p2 and I draw a line
based on both the points. So now I want to know if a particular point in the
parallel range of say 50m either on left or right sides of the line. How can
I decide this what is the formula please ?
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