document.write( "Question 371760: Given that (1,-5) and (3,7) form a pair of diameter points on a circle, find the center of the circle. \n" );
document.write( "Answer choices: \n" );
document.write( "A.) (2,1) \n" );
document.write( "B.) (1,6) \n" );
document.write( "C.) (1,1) \n" );
document.write( "D.) (-1,-6) \n" );
document.write( "E.) (4,2) \n" );
document.write( "
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