What is the radius of this circle if the circumference is 18 \pi cm? C = 18 \pi cm 3 cm 9 cm 18 cm 36 cm

asked Aug 2, 2018 1.3k views

2 votes

What is the radius of this circle if the circumference is
$18 \pi$ cm?

$C = 18 \pi cm$

3 cm
9 cm
18 cm
36 cm

$What is the radius of this circle if the circumference is 18 \pi cm? C = 18 \pi cm-example-1$

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4 votes

Circumference of a circle: С = 2πr

18π = 2πr ⇒ r = 18π/2π = 9 cm

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3 votes

Circumference= 2*pi*r

2*pi*r= 18*pi

2*r=18

r=9

Final answer: 9 cm

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