Interior of a Conic Section
Set of points on a plane from which no tangents can be drawn to a conic section.
Example
The orange portion of the graph below illustrates the interior of a hyperbola with the equation [latex]\dfrac{x^2}{4} − \dfrac{y^2}{7} = 1[/latex], that is, the region determined by the inequality [latex]\dfrac{x^2}{4} − \dfrac{y^2}{7} ≥ 1[/latex].