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• curprev 14:0614:06, 31 July 2011 Talkinaway talk contribs 1,451 bytes +1,451 Created page with "==Problem== <math>\angle 1 + \angle 2 = 180^\circ </math> <math>\angle 3 = \angle 4</math> Find <math>\angle 4.</math> <asy> pair H,I,J,K,L; H = (0,0); I = 10*dir(70); J = I ..."