inscribed circle centers of tangent circles

ב1 עמוד 368 תרגיל 25

use scroll bar to unfold problem. what is the relation between points D, E, F and the inscribed circle in triangle ABC? points A, B, C and D can all be moved around. try it.

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Translation of the Graph of a Function
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Involute of the Circle
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Trefoil knot inside Torus II
Congruent 1A2S

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