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

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The radius is directly related to the circumference of a circle by C=π 2R so it would get proportionately larger as the circumference grows.
If you start with C=π 2R where 2R=C/π then change C to C2=3C then 2R2 becomes C2/π or 3(2R)/π
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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