# One single step, and U win..

Geometry Level 4

The circle centered $$O_1$$ has radius $$a$$.
The circle centered $$O_2$$ has radius $$b$$.
The circle centered $$O_3$$ has radius $$c$$.
If $$l \parallel m$$ and $$a >b >c$$, then find

$\frac{a^2}{bc}$

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