解説Four pairs of soddy circles, four soddy lines, and the de longchamps point.png
English: Associated to the incircle and each of the three excircles of a triangle is a pair of Soddy circles and a Soddy line. The four Soddy lines concur at the de Longchamps point.
{{subst:Please link images|File:Four pairs of soddy circles, four soddy lines, and the de longchamps point.png}} ~~~~
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Associated to the incircle and each of the three excircles of a triangle is a pair of Soddy circles and a Soddy line. The four Soddy lines concur at the de Longchamps point.