don't understand the value of a sum in a curve that has arc length
Hi there
I've got a curve in :=(f(u),0,h(u)))
I know that f(x) is always bigger than zero and the parameter x is between 0 and 1.
Now 
has arc length which means
^2+h'(x)^2 } dx = 1)
. Well somenone today told me that then
^2+h'(x)^2}=1)
must be true. Can someone please explain me why this is true or isn't it true? Yet I don't understand why this has to be equal to 1...
Regards
Re: don't understand the value of a sum in a curve that has arc length
a curve is said to be parameterized by arc length if its tangent vector is of unit length.
