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Incircle, Excircle, and Nine-point Circle
Author:
Steve Phelps
Topic:
Circle
The Nine-point circle is internally tangent to the incircle and externally tangent to the three excircles.
GeoGebra
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Untitled
Loyd's Two-Greek-Crosses-to-a-Square Dissection
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apec
רישום חופשי
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