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Euclid: Elementa

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Euclid: Elementa
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If a straight line touch a circle, and a straight line be joined from the centre to the point of contact, the straight line so joined will be perpendicular to the tangent.
lat Clavius p. 273
SI circulum tangat recta quæpiam linea, a centro autem ad contactum adiungatur recta quædam linea: quæ adiuncta fuerit, ad ipsam contingentem perpendicularis erit.
kin 幾何原本 p. 147
直線切圜。從圜心作直線、至切界。必為切線之垂線。
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