Saith the Sylva Herald:

When calculating slope, there’s a generally accepted formula. . . . Then there’s Jackson County’s formula, a homemade concoction brewed for reasons no one seems to remember. With it, the odds are slim that two people would derive the same slope calculations, experts say, because the formula’s foundation is human conjecture: When figuring the average slope of a land parcel, as required by the Mountain and Hillside Development Ordinance, county employees select geographical start and end points after making best guesses about drainage paths.

This is progressive. It matters not whether the answer is correct, so long as the child feels good about himself; ergo, who even cares what the question is.