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- Dictionarycircumference/səˈkʌmf(ə)rəns/
noun
- 1. the enclosing boundary of a curved geometric figure, especially a circle. Similar
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noun
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In geometry, the circumference is the perimeter of a circle or ellipse. The circumference is the arc length of the circle, as if it were opened up and straightened out to a line segment. More generally, the perimeter is the curve length around any closed figure. Circumference may also refer to the circle itself, that is, the locus corresponding to the edge of a disk. The circumference of a sphere ... Wikipedia