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Sarekat Islam or Syarikat Islam (lit. 'Islamic Association' [1] or 'Islamic Union'; [2] SI) was an Indonesian socio-political organization founded at the beginning of the 20th century during the Dutch colonial era.
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).