Diện tích hình tròn (Vietnamese Wikipedia)
Analysis of information sources in references of the Wikipedia article "Diện tích hình tròn" in Vietnamese language version.
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books.google.com
- Hill, George. Lessons in Geometry: For the Use of Beginners, page 124 (1894).
stewartcalculus.com
- Stewart, James (2003). Single variable calculus early transcendentals (ấn bản thứ 5). Toronto ON: Brook/Cole. tr. 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 circle:
