28-04-2014
Mathematics

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What is the exact circumference of a circle with a radius of 15 cm? Answers: A. 60cm B. 30cm C. 15cm D. 10cm

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Аноним Аноним

02-05-2014

[tex]r=15cm\\\\circumference:2\pi r\\\\2\pi r=2\pi\cdot15cm=30\pi cm[/tex]

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