The circumference is the perimeter of the circle. An arc is a part of the circumference. A major arc is greater than half the total circumference, a minor arc is less than half the circumference.
The circumference of a circle = \(\pi d\) or \(2\pi r\). Look at the sector of the circle shown below. To calculate the length of the arc, we need to know what fraction of the circle is shown.
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