Art of Problem Solving
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2001 AMC 12 Problems/Problem 20: Revision history

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7 April 2022

13 August 2014

3 July 2013

9 May 2011

16 February 2009

  • curprev 14:0014:00, 16 February 2009 Misof talk contribs 1,167 bytes +1,167 New page: == Problem == Points <math>A = (3,9)</math>, <math>B = (1,1)</math>, <math>C = (5,3)</math>, and <math>D=(a,b)</math> lie in the first quadrant and are the vertices of quadrilateral <math...