Monday, February 15, 2010 10:23:55 PM
The easiest way to explain this is that in the final configuration, the two lines comprising the tops of the green and orange shapes do not together form a straight line. The slope of a line is the rise divided by the run. The line atop the green triangle has a rise of 3 and a run of 8, and therefore, a slope of 0.375. The line atop the orange shape has a rise of 2 and a run of 5, and therefore, a slope of 0.4.
This results in a gap in the shape of a very thin parallelogram with an area, as MrRubik explains, of 1 unit. The width at its widest -- in the center between the green and red triangles -- is approximately 0.117 units. (1/sqrt(73))