Euclid's Elements Book 3 - Proposition 11
If two circles, one inside the other, touch, then the line joining the centres of the circle, if extended, will cross the point where the circles touch.

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Euclid's Elements Book 3 - Proposition 12

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Euclid's Elements Book 3 - Proposition 9

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Euclid's Elements Book 1: Proposition 11, Constructing A Perpendicular Line

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Euclid's Elements Book 3 - Proposition 6

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Euclid's Elements Book 3 - Proposition 1

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Euclid's Elements - Book 8, Proposition 20

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