Abstract
This Chapter is concerned with existence of a triangle satisfying prescribed conditions. Of course, it is well-known that a, b, c are sides of a triangle if and only if a, b, c ≥ 0, b+c ≥ a, c+a ≥ b, a+b ≥ c. If we wanted to rule out degenerate triangles, we would have to omit the equality signs.
Chapter XIII also contains many criteria for the existence of a triangle and of some other figures in E2 and E3
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Mitrinović, D.S., Pečarić, J.E., Volenec, V. (1989). The Existence of a Triangle. In: Recent Advances in Geometric Inequalities. Mathematics and Its Applications, vol 28. Springer, Dordrecht. https://doi.org/10.1007/978-94-015-7842-4_1
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