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18-04-2019
Mathematics

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What is the radius of this circle if the circumference is 18π cm?

C=18π cm

3 cm
9 cm
18 cm
36 cm

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wegnerkolmp2741o wegnerkolmp2741o

18-04-2019

Answer:

9 cm

Step-by-step explanation:

Circumference of a circle is given by

C = pi * 2 *r

18 pi = pi * 2 *r

Divide each side by pi

18 = 2 r

Divide each side by 2

18/2 = 2r/2

9 = r

The radius is 9 cm

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