ABCD is a quadrilateral. <ABD=<BDA <DBC=<BCD |AB|=3 |BC|=8 |BD| is an integer. Find |DBC|.
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What do you know about "isosceles triangles"?
$\displaystyle BD=5$
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Kasty, look for your favorite 3-4-5er
Answer is 12. Many Thanks.