Respuesta :

[tex] \pi 4.5^2[/tex]
Noah11012
We can use this formula: C = 2 * [tex] \pi [/tex] * r
We can't use the diameter in this formula. We have to use the radius. And the radius is half of the diameter.

9 / 2 = 4.5

And we'll also use 3.14 for [tex] \pi [/text].

Plug in all the values:

C = 2 * 3.14 * 4.5
C = 28.26

So, the circumference is 28.26.

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