Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun geometry A plane region bounded by a semicircle of diameter 1, connected to semicircles of diameters r and (1 − r), all oriented the same way and sharing a common baseline.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

Ancient Greek, literally "shoemaker's knife".

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