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- Dictionarysemicircle/ˈsɛmɪˌsəːkl/
noun
- 1. a half of a circle or of its circumference.
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noun
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Geometric shape
In mathematics (and more specifically geometry), a semicircle is a one-dimensional locus of points that forms half of a circle. It is a circular arc that measures 180° (equivalently, π radians, or a half-turn). It has only one line of symmetry (reflection symmetry). Wikipedia