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Mathematics 59 Online
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

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)

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 ?

OpenStudy (anonymous):

sure... :/

hartnn (hartnn):

any more doubts ?

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