Abstract
Translation from the Latin of Ännotationes in locum quendam Cartesii ad
circuli quadraturam spectantem" (1758). E275 in the Enestrom index. In the
first part Euler gives a construction that he apparently found in the
manuscripts of Descartes, on constructing a series of polygons with equal
perimeters that approach a circle. In the second part Euler looks at series
like tan x + 1/2 tan (x/2) + 1/4 tan (x/4) + ... He also makes remark at the
end about the quadratrix.
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