We tour several Euclidean properties of Poncelet triangles inscribed in an ellipse and circumscribing the incircle, including loci of triangle centers and envelopes of key objects. We also show that a number of degenerate behaviors are triggered by the presence of an equilateral triangle in the family.
翻译:本文探讨了内接于椭圆且外切于内圆的庞塞莱三角形的若干欧几里得性质,包括三角形中心的轨迹以及关键对象的包络。我们还证明了该族中若存在等边三角形,则会引发一系列退化行为。