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The Arbelos

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diameter of left white circle
The dark gray region above is known as an arbelos because of its resemblance to a knife used by shoemakers in antiquity. Regardless of the placement of the central notch (which can be controlled with the slider), the length of the blue arc is
π/2
. The two light gray circles inscribed in each half of the arbelos (called Archimedes' circles) have equal radii.
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