It is an arc comprising half the circumference.
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a straight line
180 is half of 360 therefore 180 is half of a cirlce because 360 is a circle
The whole measurement of a angle.
A 180-degree arc is also called a half-circle.
A 180-degree angle is a straight line, so you could pretty much say the edge of anything (such as a book, ruler, paper, etc.).