## Arc Length Option

Press
to view the calculus menu, then
to select arc length.
The syntax is: `arc( `

*expression*`,`

*variable*
`,`

*startValue*`,`

*endValue* )

The maximum option finds the length along the curve *expression*
as *variable* ranges from *startValue* to *endValue*.

**Note:** The arc length is found by calculating the integral
.
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.