Àrea del cercle (Catalan Wikipedia)
Analysis of information sources in references of the Wikipedia article "Àrea del cercle" in Catalan language version.
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- Hill, George. Lessons in Geometry: For the Use of Beginners, page 124 (1894).
- Willebrordus Snellius. Cyclometricus;: de circuli dimensione secundum logistarum abacos & ad mechanicem accuratissima atque omnium parabilissima; eiusdemque usus .... Ex Officina Elzeviriana, 1621.
- Christiaan Huygens. De circuli magnitudine inventa. J & D Elzevier, 1654.
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stewartcalculus.com
- Stewart, James. Single variable calculus early transcendentals.. 5th.. Toronto ON: Brook/Cole, 2003, p. 3. ISBN 0-534-39330-6. «However, by indirect reasoning, Eudoxus (fifth century B.C.) used exhaustion to prove the familiar formula for the area of a disk: »
