Max of abcd
Source: China TST 2004 Quiz
February 1, 2009
geometry unsolvedgeometry
Problem Statement
In convex quadrilateral , AB\equal{}a, BC\equal{}b, CD\equal{}c, DA\equal{}d, AC\equal{}e, BD\equal{}f. If \max \{a,b,c,d,e,f \}\equal{}1, then find the maximum value of .