# Curve by Formula

Opens the Curve by Formula dialog, which is used to place any conceivable planar curve as a B-spline curve or a line string, based on a mathematical formula, from a library of pre-defined curves or by defining a custom formula.

You can access this tool from the following:

Trigonometric, hyperbolic, exponential, logarithmic, and power functions can be used to create sinusoids, spirals, catenaries, involutes, evolutes, and so on. For the creation procedures, see Creating any conceivable curve.