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OpenStudy (anonymous):
An outside circular ring has a circumference of 120 cm. What is the circumference of an inner ring which is 10 cm shorter in radius? Both circles have the same center.
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OpenStudy (anonymous):
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OpenStudy (anonymous):
outer circle circum=2pie r=120 r=19.1 inner ring which is 10 cm shorter in radius inner radius=9.1 its circum=2 pie r 2.22/7*9.1 =57.14
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