Is the circumference of a circle is tripled what happens to its radius?

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The radius is tripled, too.

Suppose:
(1) C = 2πr
(2) C' = 2πr'
(3) C' = 3C

Then
C' = 3(2πr) = 2π(3r)

But
C' = 2πr', so 2πr' = 2π(3r)

and finally

r' = 3r.
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If the radius of a circle is tripled what happens to the circumference?

Circumference = pi x diameter so if the radius is 5 then the diameter is 10 Circumference = pi x 10 = 31.415 If we triple the radius to 15, then the diameter is 30, so

What happens if you triple the radius of a circle?

If you triple the radius of a circle . . . -- You should not expect anything to happen. Those around are likely to remain completely unaware that you have done anything to yo