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This is the first page of De Circuli Magnitudine Inventa (On Finding the Magnitude of the Circle) (1654) by Christiaan Huygens (1629-1695). In this work, Huygens considered various ways to determine the accurate measurement of a circle.
Frank J. Swetz and Victor J. Katz, "Mathematical Treasures - Christiaan Huygens' De Circuli Magnitudine Inventa," Loci (January 2011)
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