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CBSE Class 8 Answered

A silver paper covers a packet of 10 choclates Coin of radiud 2cm and 7mm thickness.  How much paper need to cover 1000 such packets. 
Asked by Nimmi | 04 Feb, 2019, 12:59: PM
answered-by-expert Expert Answer
height space equals space 7 mm cross times 10 equals 70 mm equals 7 cm
radius space equals space 2 space cm
total space surface space area equals 2 πrh plus 2 πr squared equals 22 over 7 cross times 2 cross times 2 cross times 7 plus 2 cross times 22 over 7 cross times 2 cross times 2 equals 113.142 space cm squared
for space 1000 space such space packets space equals space 113 comma 142 space cm squared
Answered by Arun | 05 Feb, 2019, 11:28: AM

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