# Construction of a Conic

## Description

Diagram showing how to construct a conic when given the focus and the auxiliary circle. If the focus is outside the circle, we get a hyperbola. If it's inside the circle, we get an ellipse. If the auxiliary circle is a straight line (radius is infinite), we get a parabola.

## Keywords

circle, circles, cone, conic section, conics, construct, construction, ellipse, ellipses, foci, focus, hyperbola, hyperbolas

## Galleries

## Source:

Arthur Latham Baker *The Elements of Solid Geometr with Numerous Exercises* (Boston, MA: Ginn & Company, 1893)

Courtesy the private collection of Roy Winkelman