Define a piecewise curve [math]C[/math] in the plane, with up to 4 pieces. If you don't need all four parts, just set [math]t_{min}=t_{max}[/math] for any parts you won't use.

[i]This applet was developed for use with [url=https://www.pearson.com/en-us/subject-catalog/p/interactive-calculus-early-transcendentals-single-variable/P200000009666]Interactive Calculus[/url], published by Pearson.[/i][br]