Q: What arc is exactly 180 degrees?

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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.

A major arc

A minor arc.

180/60 is 3 degrees

180 degrees is exactly half of a circle: thus a straight line.

Related questions

Half the circumference of a circle has an arc of 180 degrees

It is half the circumference of a circle that has an arc of 180 degrees

semicircle

No. Given two points on a circle, the minor arc is the shortest arc linking them. The major arc is the longest.

An arc whose measure is less than 180 degrees is called a Minor Arc.

The complete arc of a semicircle is 180 degrees

Major Arc

A minor arc.

A major arc

180/60 is 3 degrees

180 degrees is exactly half of a circle: thus a straight line.

Semi-circle.