The length of the rectangular card is 40 cm and breadth is 10 cm. If a string is continuously wrapped around it 5 times, what is the length of the string now.
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i dont know ??from which chapter is this question??
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perimeter of the rectangle =2(l+b)
perimeter =2(40+10)=2×50
perimeter =100 cm
so,length of string in one round is 100cm
In 5 rounds it is 500cm(5×100)or 5m
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