spherical segment

In geometry, a spherical segment is the solid defined by cutting a sphere with a pair of parallel planes.

The surface of the spherical segment (excluding the bases) is called spherical zone.

The main lens is composed of two spherical surfaces, and the bifocal adds a third spherical segment, working with the back side spherical surface.

The plant's most distinctive feature and the source of its scientific name is its moniliform rhizome composed of spherical segments that can form a bead-like chain.

Among such objects were the finite size bodies of revolution (disk, finite cylinder with flat bases, finite cone, finite paraboloid, spherical segment, finite thin wire).

The bifocal spherical segment is called an add segment, but is cut into the lens in the manufacturing process and is not an actual separate piece of material glued onto main lens.

If the radius of the sphere is called R, the radius of the spherical segment bases r and r, and the height of the segment (the distance from one parallel plane to the other) called h, the volume of the spherical segment is then: