- semicircles
- n. half of a circle
English contemporary dictionary. 2014.
English contemporary dictionary. 2014.
Book of Lemmas — The Book of Lemmas is a book attributed to Archimedes by Thābit ibn Qurra. The book was written over 2,200 years ago and consists of fifteen propositions on circles. [citeweb| url=http://agutie.homestead.com/files/ArchBooLem00.htm|… … Wikipedia
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