This Maplet plots a hyperboloid of two sheets with parameters a, b, and c, together with traces and planes through the traces. Plots of the individual traces appear to the right of the hyperboloid plot. The parameters a, b, and c are chosen using the sliders. Moving the sliders re-draws the plots. Sliders may be moved with the mouse or changed incrementally by selecting with the mouse and then using the arrow keys. Trace values must be entered in the textboxes below the individual plots, and the plot button clicked to redraw the plots. The maximum height value determines how much of the hyperbola is shown. The trace values must each be within the plot shown or an error is generated. Slider bars on the plot window adjust the viewing angle. Checkboxes below the hyperboloid plot toggle the traces and planes on and off.