Increase in Circumference of circle = 5% Increase in radius is also 5% Now, increase in area of circle =\( \Large \left(2a+\frac{a^{2}}{100} \right)% \)where,a=increase in radius =\( \Large \left(2\times 5+\frac{5\times 5}{100} \right)\% \)=10.25%