To increase the area of a circle you must increase the radius.
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As the area of a circle is pi*radius2 the increase in area is a factor of 32. So tripling the radius gives an increase in area by a factor of 9.
Figure out the square root
area goes as radius squared 1.1 x 1.1 = 1.21 or 21%
The area of a circle of radius 21 is 1386
The area of a circle with a radius of 14.4 is 651.4