The radius 2

The radius of a circle is increased by 5%. What is the percentage increase in their circumference area?

Correct answer:

p2 =  10.25 %

Step-by-step explanation:

p1=100%+5%=1+1005=1.05  r2 = p1 r  S1 = π r2 S2 = π r22 = π (p1 r)2 = S1   p12  k = S1S2 = S1S1   p12  k=p12=1.052=400441=1.1025  p2=100 (k1)=100 (1.10251)=10.25%



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