It is half the circumference of a circle that has an arc of 180 degrees
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An arc that measures exactly 180 degrees is called a semicircle. In a circle, a semicircle is formed when an arc spans half of the circumference, which corresponds to 180 degrees. Semicircles are important in geometry and trigonometry, often used in calculations involving angles and circles.
Minor arc
It could be either acute or obtuse.
A Mathematical Major Arc is the larger of the two arcs formed when a circle is divided into two unequal parts. Therefore as a result the measure of a major arc is always more than 180° and the sum of the measures of the major arc and the minor arc is always equal to 360°
It measures half the sum of the arcs it intercepts.