# A circle has a circumference of 48π centimeters. If the radius of the circle is multiplied by 9, what is the circumference of the new circle?

Question
Circles
A circle has a circumference of $$\displaystyle{48}π$$ centimeters. If the radius of the circle is multiplied by 9, what is the circumference of the new circle?

2021-02-22
Use the formula for the circumference of a circle: $$\displaystyle{C}={2}π{r}$$
Let r be the radius of the original circle so that: $$\displaystyle{2}π{r}={48}π$$
$$\displaystyle{r}={48} ### Relevant Questions asked 2020-11-29 The formula \(C=2\pi r$$ relates the circumference C of a circle to its radius r.
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