It still doesn't detract from the fact that Pythagoras' Theorem only works for calculating the longest diagonal if all the sides of the object are perpendicular to each other (i.e., in this particular instance, if the rock were a perfect brick shape with squared corners).
Given that the rock in this case was actually closer to a wedge of cheese than a brick in nature, the true longest diagonal must, by definition, be a lesser number than the result given by application of Pythagoras' Theorem.
And regardless, this rock would never, ever be termed a "boulder" in the everyday use of language. It's only ever been termed a boulder by pro-guilt commentators who have a vested interest in implanting the impression that it must have been too "enormous" to have been the object that was propelled from outside through Romanelli's window.
Except for the embarrassing time when the same rock was deemed by the same pro-guilt "expert" to be eminently throwable by Knox