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Euclid: Elementa

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Euclid: Elementa
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If a straight line touch a circle, and from the point of contact a straight line be drawn at right angles to the tangent, the centre of the circle will be on the straight line so drawn.
lat Clavius p. 274
SI circulum tetigerit recta quæpiam linea, a contactu autem recta linea ad angulos rectos ipsi tangenti excitetur: In excitata erit centrum circuli.
kin 幾何原本 p. 148
直線切圜。圜內作切線之垂線。則圜心必在垂線之內。
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