Archimedes Book of Lemmas: Proposition 5 Two circles inscribed in the Arbelos, Archimedean Twins. eLearning

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Archimedes' Book of Lemmas: Proposition 5 - Arbelos, Archimedean Twins

If two circles E and F are inscribed in the arbelos tangent to the line segment CD, one on each side as shown in the figure, then the two circles, called Archimedean twins, are congruent.