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Question
If the area of the circle is increased by 21% , then what is the percentage increased in the circumference of the circle?
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Answer
(Pie)R2^2 = 1.21(Pie)R1^2
R2=1.1R1 , what they are asking is inc in circumference
ie (2pieR2-2PieR1)/2PieR1 =R2/R1-1
1.1-1 = 0.1 ie 10 percent inc
