This looks correct to me. usacre = 10 surveychain^2 surveychain = 66 surveyft surveyft = 1200/3937 meter 10*(66*1200/3937)^2) = 4046.8726098410 1 mile^2 = 2589988.1 meter 2589988.1/4046.8726098410 = 639.9974374537
Note that the surveyfoot is .3048006096 meter while the standard foot is .3048 meter and the mile is defined in terms of standard feet: (.3048/.3048006096)^2 = .9999960000 639.9974374537/640 = .9999959960 > the default foot in the US is not the survey foot, so it is odd that the > default acre is set to use survey feet. Why? The acre is a survey unit. The country was surveyed in survey units: we are stuck with them. Your change would enlarge my farm by .00028 acres and push my farthest boundary back .03 inches :) -- John Hasler [EMAIL PROTECTED] Elmwood, WI USA -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
