a semi-circle
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No. Given two points on a circle, the minor arc is the shortest arc linking them. The major arc is the longest.
An arc that lies between the sides of a central angle of 180 degrees is known as a semicircle. A central angle of 180 degrees is half of a full circle, so the corresponding arc covers half of the circumference of the circle. In geometric terms, a semicircle is a special case of an arc where the angle subtended by the arc is exactly 180 degrees.
A major arc
A minor arc.
180/60 is 3 degrees