geometric definitions and standard equations ofparabolas, ellipses, and hyperbolas.

curves are called conic sections or conics

Reflective Propertiesapplications of parabolas involve their use asreflectors of light and radio waves.Rays originating at a parabola’s focus are reflected out ofthe parabola parallel to the parabola’s axis

If an ellipse is revolved about itsmajor axis to generate a surface (thesurface is called an ellipsoid ) andthe interior is silvered to produce amirror, light from one focus will bereflected to the other focusEllipsoids reflect sound the sameway, and this property is used toconstruct whispering galleries,rooms in which a person standing atone focus can hear a whisper fromthe other focus.

Replace the Cartesian equations by equivalent polar equations