Illustration of a right circular cone that has been cut by a plane parallel to the base. The lower part…

Illustration of a right circular cone that has been cut by a plane parallel to the base. The top section…

A rolled out image of a cone by dividing the base in equal parts and arcs to measure the true lengths.

Illustration of a frustum of a right circular cone with hidden edges shown. When a cone is cut by a…

Illustration of a frustum of a right circular cone. When a cone is cut by a plane parallel to the base,…

Possible forms of the invariable cone by means of the intersections with a concentric spherical surface.

Illustration of a right circular cone with the diameter of the base equal to the height of the cone.

Illustration of a right circular cone with the diameter of the base greater than the height of the cone.

Illustration of a right circular cone resting on an element such that the vertex is on the bottom and…

The lines which join corresponding points in an involution on a conic all pass through a fixed point;…

The cone is sliced by a circle in a plane perpendicular to the axis. This can be drawn without knowledge…

The cone is sliced by a ellipse by making an angle within the plane. This can be drawn with knowing…

The cone is sliced by a hyperbola within a plane. The angle of the hyperbola will make a smaller angle…

The illustration shows the cylinder rolled out in a tangent plane of the base to create a development…

An illustration of a hexagonal prism rolled out, or "stretched out" in the straight line AB.

An image of a hexagonal pyramid stretched out. The length of the edges are equal plane, and intersects…

The lines joining any point on a conic to the two foci are equally inclined to the tangent and normal…

"An oblique cone connecting two parallel pipes of different diameters... the true size of the base is…

A development or rolled out oblique cone using triangulation. The method of triangulation is done by…

A stretched out image of the octagonal dome by using projection or with dividers to create a five-piece…

The segments between the point of intersection of two tangents to a conic and their points of contact…

The illustration of a rectangular pyramid unfolded by creating edges equal length to the base and meeting…

Five points are given, of which not three are in a line, a curve of second order may be drawn through…

An illustration in flattening the sphere using Gore method by creating cylinder sections with equal…

An illustration of a development of sphere using Zone method by creating sections of rolled out cones.

Illustration showing the development of a sphere by the perspective of its resolved cones.