[tex]|AB|=3,|AC|=4\\\\|AC|=r_a+r_c, r_c=|AC|-r_a\\2r_a+2r_c=2r_b\\r_a+r_c=r_b\implies r_b=4\\\\|AB|+r_a=r_b\\r_a=r_b-|AB|\implies r_a=1\\r_c=|AC|-r_a\\r_c=3\\\\\begin{cases}r_a=1\\r_b=4\\r_c=3\end{cases}[/tex]
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[tex]|AB|=3,|AC|=4\\\\|AC|=r_a+r_c, r_c=|AC|-r_a\\2r_a+2r_c=2r_b\\r_a+r_c=r_b\implies r_b=4\\\\|AB|+r_a=r_b\\r_a=r_b-|AB|\implies r_a=1\\r_c=|AC|-r_a\\r_c=3\\\\\begin{cases}r_a=1\\r_b=4\\r_c=3\end{cases}[/tex]