If the triangle is equilateral, then r = 1 and [r]+[-r] = 0;

otherwise,

r != 1 and (-1+sqrt(5))/2 < r < (1+sqrt(5))/2 and [r]+[-r] = -1.

Edited on March 19, 2007, 1:10 pm

Edited on March 19, 2007, 1:11 pm

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