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In any triangle $ABC, r_1r_2+r_2r_3+r_3r_1=$

\[(a)\;\frac{\Delta ^2}{r^2} \quad (b)\;\frac{\Delta}{r} \quad (c)\;\frac{2 \Delta}{r} \quad (d)\;\Delta ^2 \]

1 Answer

$(a)\;\frac{\Delta ^2}{r^2}$
answered Nov 7, 2013 by pady_1
 
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