Bisector Bi=2 sector=split so split into two parts.
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Oval 0 Angle ^ Half circle C Right angle L Star * Straight Line / Curved Line S Acute Angle V Point . Two intersecting lines X
a line
a line
Half of a revolution of a circle is 180 degrees and its angles added together are supplementary.
in complex math the name for a 180 degree angle would be called a straight line