The femisphere is a solid figure that has one single surface, two edges, and four vertices.

Femisphere
Femisphere

Description

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The form of the femisphere is reminiscent of that of a sphericon but without straight lines. Instead of that, it has circular arcs of arbitrary radius. For this reason, when rolled over a sphere, it contacts the whole surface area of it in a single revolution.[1][failed verification]

The area of a femisphere of unit radius is  .

Wooden femispheres can be made by turning them on a wood lathe.

See also

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References

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