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Mathematics 17 Online
OpenStudy (anonymous):

The two circles below are similar. http://gyazo.com/c165e5cd15065998565b04750fc469e8 The circumference of the big circle is 12 cm. The radius of the small circle is half the size of the radius of the big circle. What is the circumference of the small circle? A 3 cm B 18 cm C 6 cm D 24 cm

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