Illustration of pattern showing steps to make a barn. The barn is a composite figure made up of a triangular…

Illustration showing the intersection of a plane with a cone. The solid is shown in perspective and…

Illustration of pattern showing steps to make a house. The house is a composite figure made up of a…

Illustration of an irregular solid form made up of triangular surfaces on a flat surface.

Illustration of an irregular solid form made up of triangular surfaces unfolded on a flat surface. A…

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