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Q&A #1895


Distance from a point to a line.

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From: ---
To: Teacher2Teacher Service
Date: Aug 20, 1999 at 11:43:24
Subject: Distance from a point to a line.

Part of our new grade ten curriculum here in Ontario, Canada includes the
use of the formula d = Abs(Ax+By+C)/Sqrt(A^2+B^2). Sorry about the form!

It is not difficult to show this using specific examples where the point
and the equation of the line are given, but the usual derivation (using the
dot product) is of no use here. Any ideas?

Carolyn

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