## Arc Length Option

Press
to access the arc length option
which finds the length of a curve between two values.

Next, enter an expression, the variable, a start value, and an end value
separated by commas. For example, to find the length of the curve y = x^{2}
between x = 2 and x = 3 inclusive, enter

2
2 3

**Note:** The error is described as tolerance, *tol*. The value of `tol`

is used to determine how accurate to calculate
this integral. The TI tries to keep the absolute error under `tol`

.
A smaller value yields a more accurate integral but takes longer to compute.
It can be changed in the tolerance editor available by pressing
. Its
value is typically about 0.001.