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Archimedes
Quadrature of the Parabola
Proposition 1 [quoting]
If from a point on a parabola a straight line be drawn which is either itself the axis or parallel to the axis, as PV,
and if QQ' be a chord parallel to the tangent to the parabola at P and meeting PV in V,
then QV=VQ'.
Conversely, if QV=VQ', the chord QQ' will be parallel to the tangent at P.
Archimedes. “Quadrature of the Parabola.” In The Works of Archimedes. Ed. T.L. Heath. Cambridge UP, 1897. Obtained at
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