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yields An angle of \ alpha degrees has a size in radians given by and so the arc length equals A practical way to determine the length of an arc in a circle is to plot two lines from the arc 's endpoints to the center of the circle , measure the angle where the two lines meet the center , then solve for L by cross-multiplying the statement : For example , if the measure of the angle is 60 degrees and the Circumference is 24 " , then This is so because the circumference of a circle and the degrees of a circle , of which there are always 360 , are directly proportionate .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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