On the measure of axial symmetry with respect to folding for parallelograms

Open Access
Original Paper

DOI: 10.1007/s13366-011-0033-y

Cite this article as:
Nowicka, M. Beitr Algebra Geom (2012) 53: 97. doi:10.1007/s13366-011-0033-y


Let Cm be a subset of a planar convex body C cut off by a straight line m, which remains in C after folding it along m. The maximum masf(C) of the ratio of the double area of Cm to the area of C over all straight lines m is a measure of axial symmetry of C. We prove that \({{{\rm masf}}(P) > \frac{1}{2}}\) for every parallelogram P and that this inequality cannot be improved.


Convex body Folding Measure of axial symmetry Parallelogram 

Mathematics Subject Classification (2000)

52A10 52A38 
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Copyright information

© The Author(s) 2011

Authors and Affiliations

  1. 1.University of TechnologyBydgoszczPoland

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