length of a coil

[lugo35]

hi all does anyone know the formular for the length of a coiled tape for instance. cheers andy

 

[PaulH]

Andy,

The circumference of a circle is pi (approx 3.14) multiplied by its diameter. You could therefore approximate the length of a coil using:

circumference = 3.14 * diameter * number of coils

where the "diameter" is measured to the centre of the "thickness" of the coil if you see what I mean. (I'm assuming that each coil rests on the outside of the next inner one).

Hope this helps,
Paul.

 

[Chris Knight]

Google is your friend
http://mathforum.org/library/drmath/view/53769.html

 

[lugo35]

thanks will use easy method dont need it that accurate as in what water posted