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If the areas of three adjacent faces of a rectangular box which meet a corner are `12cm^2`, `15cm^2` and `20cm^2` respectively. Then the volume of the box is
किसी आयताकार बकसे के तीन सन्नीकट फलक, जो एक कोने में मिलते है, का क्षेत्रफल क्रमशः 12 `से.मी.^2` 15 `से.मी ^2` और 20 `से.मी.^2` है तो बक्से का आयतन क्या होगा?

A

`A) 3600 cm^3`

B

`B) 300 cm^3`

C

`60 cm^3`

D

`180 cm^3`

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The height and the total surface area of a right circular cylinder are 4 cm and 8 pi sq.cm. respectively. The radius of the base of cylinder is एक लंबवृत्तिय बेलन की ऊँचाई और कुल पृष्ठिय क्षेत्रफल क्रमशः 4 से.मी, और 8 pi वर्ग से.मी. है। उस बेलन के आधार की त्रिज्या बताइए।

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