| 1. | Such a point of contact must be a tangency.
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| 2. | The two points of tangency are also double points.
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| 3. | This is also known as the flow tangency condition.
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| 4. | The property of tangency is defined as follows.
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| 5. | The points where these perpendiculars cross the sides are the desired points of tangency.
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| 6. | He met Kepler, and discussed with Fran�ois Vi�te two questions about equations and tangencies.
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| 7. | The complexity enters when calculating intersections at points of tangency and intersections along positive dimensional sets.
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| 8. | The point of tangency travels around the deltoid twice while each end travels around it once.
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| 9. | Figure 4 : Tangency between circles is preserved if their radii are changed by equal amounts.
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| 10. | Their points of tangency with the nine-point circle form a triangle, the Feuerbach triangle.
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