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OpenStudy (anonymous):
The radius of a circle is 10/pi. How many inches long is its circumference? F. 20/pi G. 200/pi H. 10 J. 20 K. 40
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OpenStudy (campbell_st):
the formula is \[C = 2 \pi r \] C = circumference r = radius just substitute and evaluate
OpenStudy (anonymous):
so it's 2*pi*10 in this case?
OpenStudy (campbell_st):
isn't it \[C = 2 \times \pi \times \frac{10}{\pi}\] which needs to be evaluted
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