Question

What object is defined using a directrix and a focus? Perpendicular bisector angle bisector circle parabola

Answer 1

Conic sections are defined using a directrix (a fixed line used in describing a curve or surface) and a focus, and those are: parabola, ellipse, and hyperbola. 

Answer 2

Parabola because the directrix line and focus line are equivalent when touching a point on a parabola