दिए गए आरेख की परिभ्रमण त्रिज्या ज्ञात करें।

1
\(\frac{{B{D^3}}}{{12}} - \frac{{b{d^3}}}{{12}}\)
2
\(\frac{{B{D^3} - b{d^3}}}{{12\left( {BD - bd} \right)}}\)
3
\(\sqrt {\frac{{B{D^3} - b{d^3}}}{{12\left( {BD - bd} \right)}}}\)
4
\(\sqrt {\frac{{B{D^3} - b{d^3}}}{{3\;BD}}}\)

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