Sharp upper and lower bounds for the isoperimetric deficit of triangles or parallelograms with the minimal annulus of radii RR and rr are given.
DOI: 10.52737/18291163-2023.15.1-1-15 Armenian Journal of Mathematics, 15(1) 1-15
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Isoperimetric Inequality, Minimal Annulus, Bonnesen Inequality, Favard Inequality
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