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Generalising a triangle inequality

Published online by Cambridge University Press:  17 October 2018

Zoltan Retkes*
Affiliation:
9 North Avenue, Coventry CV2 4DH e-mail: [email protected]

Extract

The main goal of this paper is to give a deeper understanding of the geometrical inequality proposed by Martin Lukarevski in [1]. In order to formulate our results we shall introduce and use the following notation throughout this paper. Let A1A2A3 be a triangle a1, a2, a3, the lengths of the sides opposite to A1, A2, A3 respectively, P an arbitrary inner point of it xi, the distance of P from the side of length ai. Let r, R be the inradius and circumradius of the triangle hi, the altitude belonging to side ai, Δ the area and finally let α be a real parameter. We adopt also the use of Σui to refer the sum taken over the suffices i = 1, 2, 3. Now we are in the position to reformulate the original problem into a more general form namely: find bounds for Σxαi in terms of r and R. The main results of our investigation are summarised in the following theorem.

Type
Articles
Copyright
Copyright © Mathematical Association 2018 

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References

1. Problem Corner 101.A, Math. Gaz. 101 (March 2017) p. 150.Google Scholar
2. Steinig, J., Inequalities concerning the inradius and circumradius of a triangle, Elemente der Mathematik, 18 (1963) pp. 127131.Google Scholar
3. Leuenberger, F., Dreieck und Viereck als Extremalpolygone, Elemente der Mathematik, 15 (1960) pp 7779.Google Scholar