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Podiatrist

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Real-Life Math

A mother has brought her young daughter to you. She says her daughter tends to walk on the outside edges of her feet.

You're going to measure the angle of the heel. You need to see whether the angle, called eversion, is at more of an angle than is normal. You measure the angle with a protractor, with the child lying on her stomach on your examining table.

The heel should be perpendicular (straight up and down) by the age of 8. For a newborn, up to 8 degrees of angle is fine. Each year, the angle should decrease by 1 degree.

So, to see if the angle of the heel is normal, you add the patient's age to the angle. This should always total 8 (assuming the patient is 8 or younger). Or, given a patient's age, we can subtract it from 8 to get the angle at which their heel should be.

Clear as mud? OK, see if you can answer these questions:

  1. If the woman's daughter is 5, what should her heel eversion be?
  2. If the girl is 2, what should her heel eversion be?
  3. Her heel eversion is 5 degrees. What would her age be for this to be normal?

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