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OpenStudy (anonymous):
Help Please?!?! What is the exact circumference of the circle? http://lv.k12.com/mediaFiles/Ninth_Grade/Math/Unit17525/Lesson68692/VHS_PA_S2_03_L209_L309_Q1.gif A.10π feet B.20π feet C.40π feet D.60π feet
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hartnn (hartnn):
that 20 feet is radius or diameter ?
OpenStudy (anonymous):
Diameter I believe
hartnn (hartnn):
Ciecumference \(C = 2\pi r = \pi d \) where r= radius, d= diameter.
OpenStudy (anonymous):
what?
hartnn (hartnn):
Circumference is just diameter multiplied by pi (π)
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OpenStudy (anonymous):
witch came out as 62.8...
terenzreignz (terenzreignz):
Leave out the pi as a factor, the choices seem to call for it.
hartnn (hartnn):
you'll need the answer in π , so keep it as it is
OpenStudy (anonymous):
???.. so it would be D. 60π feet
hartnn (hartnn):
diameter = 20 , Circumference = Diameter * π=20π got this ?
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OpenStudy (anonymous):
sure... :/
hartnn (hartnn):
any more doubts ?
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