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एक आयत की लम्बाई तथा चौड़ाई के मापन में प्रतिशत त्रुटि क्रमश: `3%` व `2%` है। इन प्रेक्षणों से आयत के क्षेत्रफल की गणना में अधिकतम कितने प्रतिशत त्रुटि होगी ?

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आयत का क्षेत्रफल (A ) = लम्बाई ( L )` xx` चौड़ाई ( B )
` therefore ((Delta A)/( A) xx100) _(max ) =( Delta L) /(L ) xx100 +( Delta B)/( B ) xx100`
` = 3+2= 5% `

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