An arc is part of a circle.  A circle is 360o, so an arc will be some portion of 360o.   An arc is signified by its endpoints with a small arc symbol over the two endpoints and are classified according to their measure.  A minor arc has a measure less than 180o.  A major arc has a measure greater than 180o.   If the arc's measure is exactly 180o, then it is called a semicircle.  



The length of the arc of a circle will be explored in the measurement book of this unit.



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