Illustration of the development of a cone. When the cone covered in paper (figure a) is rolled out on…

Illustration of the development of a cone along a stretchout described with the radius OB.

Illustration of the development of a cylinder. The cylinder is covered with paper (a) and then rolled…

Illustration of the development of a pyramid. When the pyramid covered in paper (figure a) is rolled…

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