ABSTRACT
The Distance Between a Point and a Line
a b
ab
a+b 2
—Charles D. Gallant
—Richard A. Gibbs
a
b
c
d
a
d
Reprinted from “Proofs Without Words: Exercises in Visual Thinking”, by Roger B. Nelsen. Copyright 1993 by The Mathematical Association of America, pages: 3, 40, 49, 60, 70, 72, 115, 120.
