The scientific measurement and mathematical study of circles, including their circumferences, areas, and properties.
From Greek kyklos (circle) + metron (measure) + -ia (condition of). This term emerged in the 16th-17th centuries as mathematicians developed systematic ways to measure and understand circular forms.
The quest for cyclometry led directly to the discovery of pi (π)—mathematicians realized you can never perfectly measure a circle because the ratio is irrational, which blew minds in ancient times.
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