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"Circle geometry" as a book category covers the theory, problems and applications centered on circles and circle-related configurations: properties of chords, arcs, tangents, secants, inscribed and central angles, cyclic quadrilaterals, power of a point, inversion, homothety, Apollonius and Ptolemy-type results, and classical Euclidean constructions. Titles in this category range from elementary introductions and problem/contest collections aimed at high-school students to advanced texts and research monographs treating inversion, circle packings, Möbius transformations, and computational or applied uses in design and engineering—typically with many diagrams, proofs and construction techniques.

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