Key features of this model:

• Description: Find the maximum area of a rectangle within a circle.
• Category: Non-linear functions.
• Type: NLP.
• Library: Pyomo.
• Solver: IPOPT.

Notes:

• Includes alternative scenarios where the values of some variables are fixed/unfixed using the fix() and unfix() Pyomo functions.
• Added printing of final scenario, which was omitted from original code.

GitHub: Biggest rectangle in a circle.