What rilla said is right. It's just a geometry problem.
I just visualized the problem, reduced it to a circle and a rectangle and then drew a picture.
Once I drew the picture, the Pythagorean theorem just jumped right out at me, so it was really as easy as that.
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Interesting fact.
The turning circle described by the rear wheels is always smaller than the turning circle described by the front wheels.
(EDIT: for front wheel steering vehicles moving forward.)
This is even true for motorcycles and bicycles.
(If the trailing wheel is not in line with the front wheel, the bike will turn in the direction of the back wheel.)
This means that every time you turn, the front of the car travels further than the back of the car.
Over the life of the vehicle, this adds up. I wonder how much, really.
Anyway, point is... the front of your car has different mileage than the back of your car.
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