Respuesta :

xXGiratinaXx

Answer:

18 pi

Step-by-step explanation:

the formula for circumference of a circle is 2*pi*r. (r = radius)

so then the radius is 9 so then its 9 * 2 * pi. just leave pi there so 9*2 = 18 so there's your answer 18 pi

Answer:

56.52m

Step-by-step explanation:

This is because pie is commonly substitued as 3.14 and since the formula of a cicumference is piRx2 it would be 56.52

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