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ABCD passes through the centres of the three circles as shown in the figure. AB=2 cm and CD=1 cm. If the area of middle circle is the average of the areas of the other two circles, then what is the length (in cm) of BC?
जैसा कि आकृति में दर्शाया गया है, ABCD तीनों वृत्तों के केन्द्रों से गुजरती है। AB=2 से, मी. तथा CD=1 से. मी. हैं। यदि मध्य वृत्त का क्षेत्रफल, शेष दोनो वृत्तों के क्षेत्रफलो का औसत है, तो BC की लंबाई (से.मी. में) क्या हैं?

A

`(sqrt6)-1`

B

`(sqrt6)+1`

C

`(sqrt6)-3`

D

`(sqrt6)+3`

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