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Dear Prof Janet

Other then Concentric circles, spheres. semi circles , which other circular shapes can be constructed concentric ?.

As a example - Concentric cone, Inverted Concentric cone, concentric parabola, concentric ellipse, concentric hyperbola etc ?.

Also can we also have concentric shapes for Lines shapes viz Kite, Trapezoid, Rhombus, Parallelogram etc

Thanks & Regards,
Prashant S Akerkar

Yes, there are concentric conics. They have the same center or axis of symmetry. Note, however, that neither a parabola nor a hyperbola is circular.

As for line shapes, the Wikipedia page states that regular polygons and polyhedra can be concentric. That would seem to exclude kites, rhombi, etc., but I see no reason that they cannot be concentric, too.

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Janet Yang


I can answer questions in Algebra, Basic Math, Calculus, Differential Equations, Geometry, Number Theory, and Word Problems. I would not feel comfortable answering questions in Probability and Statistics or Topology because I have not studied these in depth.


I tutor students (fifth through twelfth grades) and am a Top Contributor on Yahoo!Answers with over 24,000 math solutions.

Co-author of An Outline of Scientific Writing: For Researchers With English as a Foreign Language

I have a Bachelor's degree in Applied Mathematics from the University of California at Berkeley.

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George White Elementary School. Homework Help program at the Ridgewood Public Library, Ridgewood, NJ. Individual students.

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