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Acres to miles: conversion problem (book error?)

  1. Aug 29, 2012 #1
    1. The problem statement, all variables and given/known data

    Problem 2.2 An acre is defined such that 640 acres = 1 mi2. How many square meters
    are in 1 acre?


    2. Relevant equations

    Solution From Table 2.1,
    1 mi = 1.609 km = 1609 m
    1 acre = 1/640 mi ^2

    3. The attempt at a solution

    My solution comes from wolfram alpha
    4286 m^2

    BOOK SOLUTION: 4.05 X 10^3 m^2

    my on a calculator: 4045.13

    So, why did wolfram get it wrong?
    (1/604)(1609 m)^2 --> wolfram
     
  2. jcsd
  3. Aug 29, 2012 #2
    Can you see it?
     
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