A point $D$ inside an equilateral triangle $PQR$. $D$ is located at a distance of $3$cm, $4$cm and $5$cm respectively from $P$, $Q$ and $R$. What is the area of the triangle $PQR$?
closed as off-topic by Cameron Buie, Matthew Conroy, user1337, M Turgeon, Davide Giraudo Jan 18 at 20:35
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