Illustration showing a circle formed by the intersection of a plane perpendicular to the axis of the…

Illustration showing an ellipse formed by the intersection of the surface of a cone with a plane neither…

Illustration showing an ellipse (and circle) as a section from a cylinder.

Illustration showing a hyperbola as a curve formed by the intersection of the surface of a cone with…

Illustration showing the definition of a hyperbola as a conic section.

"A regular township, according to United States surveys, is 6 miles square and is divided into 36 equal…

Illustration showing a parabola as a curve formed by the intersection of the surface of a cone with…

Illustration showing the definition of a parabola as a conic section. The plane cuts the cone parallel…

"Running-part. Naut., that part of a rope which is hauled upon is called the hauling-part (b), the part…

Illustration showing intersecting straight lines meeting to form a triangle. It is formed by the intersection…