# 4. Construct a Triangle Given Its Circumradius, Inradius and a Vertex Angle

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This Demonstration constructs a triangle given its circumradius , inradius and the angle at .

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Contributed by: Izidor Hafner (August 2017)

Open content licensed under CC BY-NC-SA

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Reference

[1] D. S. Modic, *Triangles, Constructions, Algebraic Solutions* (in Slovenian), Ljubljana: Math Publishers, 2009, p. 82.