document.write( "Question 1210153: A and B are two points on a sphere of radius 2. We know the space distance between A and B is 2, What is distance from A to B along the (minor) arc of a great circle?
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Algebra.Com's Answer #851403 by Edwin McCravy(20055)\"\" \"About 
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document.write( "The triangle is equilateral, so the central angle is 60o,\r\n" );
document.write( "so the arc is \"60%5Eo%2F360%5Eo+=+1%2F6\" of the circumference of a great circle.\r\n" );
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document.write( "The circumference of a great circle is \"2%2Api%2Ar=2%2Api%2A2=4%2Api\"\r\n" );
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document.write( "The length of the arc is \"expr%281%2F6%29%2A4pi\" or \"expr%282%2F3%29pi\".\r\n" );
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document.write( "Edwin
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