Mention877768

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so:text If in two ellipses having a common major axis we take two such arcs that their chords are equal, and that also the sums of the radii vectores, drawn respectively from the foci to the extremities of these arcs, are equal to each other, then the sectors formed in each ellipse by the arc and the two radii vectores are to each other as the square roots of the parameters of the ellipses. (en)
so:isPartOf https://en.wikiquote.org/wiki/Johann_Heinrich_Lambert
qkg:hasContext qkg:Context432836
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