Art of Problem Solving

Trapezoid: Revision history

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2 January 2024

24 April 2023

1 February 2022

4 April 2018

25 November 2007

25 October 2007

21 October 2007

20 October 2007

19 October 2007

18 October 2007

1 November 2006

30 October 2006

13 October 2006

12 July 2006

30 June 2006

27 June 2006