Incircle, Excircle, and Dandelin Spheres

主題：球形

In the plane, the excircle and incircle are tangent to a side of the triangle. These points of tangency are the foci of an ellipse formed by Dandelin Spheres.

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Part C
reflec about line
Quick Graphs Using Slope Intercept Form
The unit circle and sin, cos and tan functions

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垂心
Linear Equations
長方體
對稱
四邊形

Incircle, Excircle, and Dandelin Spheres

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