document.write( "Question 754364: AB is a chord of a circle centre O. The radius of the circle is 50 cm long and the length of AB is 60 cm. What is the distance of AB from O? \n" ); document.write( "
Algebra.Com's Answer #459022 by Edwin McCravy(20060)\"\" \"About 
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document.write( "Draw OC the perpendicular bisector of the chord, which\r\n" );
document.write( "divides the 60 cm chord into two 30 cm line segments,\r\n" );
document.write( "AC and BC.  We are looking for the length of OC:\r\n" );
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document.write( "Use the Pythagorean theorem on right triangle ACO\r\n" );
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document.write( "OAē = ACē + OCē\r\n" );
document.write( "50ē = 30ē + OCē\r\n" );
document.write( "2500 = 900 + OCē\r\n" );
document.write( "1600 = OCē\r\n" );
document.write( "√1600 = OC\r\n" );
document.write( "40 = OC\r\n" );
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document.write( "Answer: 40 cm.\r\n" );
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document.write( "Edwin
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