On the dining room table, you scatter a handful of peas, and throw in a little red bean. How many straight lines can you see connecting between 2 peas and 1 red bean?

When points are co-linear, it means there is a straight line, visible or invisible, that connects through them.

I suppose there are collinearities in things and ideas too.

Here is a java applet that shows the collinearity concept. In the source code, see the calculation in Point.collinear() function.

— 2003. 03. 01