27
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10 x 3 = 30
If the radius of a sphere is tripled, the surface area increases by (3)2 = 9 times, and the volume increases by (3)3 = 27 times.
C1 = pi x D, C2 = pi x 3 x D, so the circumference is also tripled.
The circle becomes an oval
The volume increases to 9 times as much.