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Help needed for simple problem http://forum.alglib.net/viewtopic.php?f=2&t=4378 
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Author:  CevicanAnders [ Thu Mar 18, 2021 1:36 pm ] 
Post subject:  Help needed for simple problem 
I am not a mathematician but I would appeciate some assistance in how to model the following geometrical problem. We have a rectangle with rounded corners that must fit within a circle (Not necessarily tangent edges of circle). W Width of rectangle H Height of rectangle R Radius of rectangles corner D Diameter of circle Approximate domains: W [10..100] Continuous or discrete range H [10..100] Continuous or discrete range R [1..100] Continuous or discrete range (Deliberately too large) D [10,12,14,16,20,30] Discrete set Constraints C1 R < 0.5 W C2 R < 0.5 H (C3 (W2R)^2 + (H2R)^2 <= (D2R)^2) Replacing C3 by substitution with the following Constraints C4 A=W2R C5 B=H2R C6 C=D2R C7 A^2 + B^2 <= C^2 We want to maximize/minimize each variable (typically W, H, R) for each diameter D If we have understood it correctly, this is a QCLP  a linear objective function (single variable) with a mix of linear/quadratic equality/inequality constraints. Note: This is just an example and we do know how to solve it manually of course  however we are trying to understand how such a model can be setup and solved in Alglib. 
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