A Solution to Crux Mathematicorum Problem 5021
A direct-similarity generalization proved with Pappus's theorem and a radical axis, presented without reproducing the original problem statement.
Problems
Problems and solutions
Entries are organized by topic, method, and an editorial 1–10 difficulty scale. When a source statement cannot be republished, the archive presents the solution only and links to the source.
A Solution to Crux Mathematicorum Problem 5031
A concise incircle-inversion proof using contact-chord midpoints and a cyclic quadrilateral, presented without reproducing the original problem statement.
A Solution to Crux Mathematicorum Problem 5088
A concise angle-chasing proof through tangency and cyclic quadrilaterals, presented without reproducing the original problem statement.
A Solution to Crux Mathematicorum Problem 5098
A unit-circle complex proof that reduces two geometric conditions to the same algebraic equation, presented without reproducing the original problem statement.
A Solution to Crux Mathematicorum Problem 5109
A synthetic fixed-point argument and a projective generalization, presented without reproducing the original problem statement.
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