Heel height formula?

from the Daily Mail today: http://www.dailymail.co.uk/femail/a…-heels-won-t-cripple-s-remarkably-simple.html

from the Daily Mail today: http://www.dailymail.co.uk/femail/a…-heels-won-t-cripple-s-remarkably-simple.html

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Heel height formula?