inscribed circle centers of tangent circles

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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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גיליון אלקטרוני להעלאת נתוני בעיה ויצירת גרף בהתאם
Graphical solution of ax² + bx + c = k
Trefoil Knot
Level Curves
Circles - Relative Positions

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Domain and range of exponential function
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Addizione
Funzione tangente
Piani
Logaritmi
Divisione