The area becomes 16 times as much as it used to be.
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The area quadruples.
It quadruples.
Nothing - if you double the radius you will get the diameter. The area of the circle will remain the same
the surface area quadruples.
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.