A characteristic a-separate compound coral. The columns are prismatic and their walls pierced by regular…

Illustration of a right circular cylinder with a smaller cylinder removed from the center and placed…

Illustration of a thin hollow cylinder. It resembles a washer and is often referred to as a disc.

Illustration of a right circular cylinder with the height larger than the diameter.

Illustration of 2 right circular cylinders in which one cylinder is twice the height of the other.

Illustration of 2 right circular cylinders in which one cylinder is twice the height and twice the diameter…

Illustration of 3 right congruent tangent circular cylinders. The height of all the cylinders is greater…

Illustration of 3 right congruent tangent circular cylinders.

Illustration of 3 right congruent tangent circular cylinders. The height of all the cylinders is greater…

Illustration of 4 congruent tangent right circular cylinders. The height of all the cylinders is greater…