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OpenStudy (anonymous):
What is the exact circumference of the circle? A. 10 feet B. 20 feet C. 40 feet <-- my answer D. 60 feet Am I right
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OpenStudy (anonymous):
OpenStudy (rock_mit182):
\[c= 2\pi*r\]
OpenStudy (anonymous):
not exactly to get the circumference you multiply the diameter by pi
OpenStudy (rock_mit182):
of course you do
OpenStudy (rock_mit182):
the circumference is the perimeter of the circle (area)
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OpenStudy (mathmale):
\[c= 2\pi*r\] is the correct formula for the circumference of this circle. Please look carefully at the illustration you've provided. What is the radius of this circle?
OpenStudy (mathmale):
Note that CoralReef's approach is completely valid also. Take your pick, @♥Lila♥
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