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What makes four points concyclic?

Geometry Level 2

If $\left(m_i,\dfrac{1}{m_i}\right)$ where $i=1,2,3,4$ are the coordinates of four concyclic points, then what is the value of $m_1m_2m_3m_4$ ?

\infty

0

-1

1

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by Nihar Mahajan

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