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दो त्रिभुजें ABC और DEF इस प्रकार है की ...

दो त्रिभुजें ABC और DEF इस प्रकार है की AB =5सेमि., ` ar (Delta ABC)=20` सेमि `""^(2 ) ` तथा ` ar (Delta DEF) =45` सेमि `""^(2 ) ` यदि ` Delta ABC~ Delta DEF ` हो तो DF का मान ज्ञात करो|

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