Geometrical definition of Pi and its approximations by nested radicals
The Teaching of Mathematics, Tome 2008 (2008) no. 20, p. 25.

Voir la notice de l'article dans European Digital Mathematics Library

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     author = {Milan Janji\'c},
     title = {Geometrical definition of {Pi} and its approximations by nested radicals},
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Milan Janjić. Geometrical definition of Pi and its approximations by nested radicals. The Teaching of Mathematics, Tome 2008 (2008) no. 20, p. 25. https://geodesic-test.mathdoc.fr/item/TM_2008__2008_20_256864/