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Mathematics 19 Online
OpenStudy (ineedhelp10):

help

OpenStudy (ineedhelp10):

if the circumference of a circle is 4/3pi inches, how long is the radius, in inches?

OpenStudy (agreene):

remember that \[\sf C=2\pi r\] so, we have \[\frac{4}{3}\pi=2\pi r\] then just solve for r

OpenStudy (ineedhelp10):

okay, i get that we're supposed to divide next but i dont get how that process will look like

OpenStudy (agreene):

\[\frac{4\pi}{3}=2\pi r\\\frac{\frac{4\pi}{3}}{2\pi}=r\] \[\large\frac{\frac{\color{blue}{4} \color{red}{\cancel\pi}}{3}}{\color{blue}{2}\color{red}{\cancel\pi}}=\frac{2}{3}\]

OpenStudy (ineedhelp10):

oh the mistake i was doing was that i was dividing by 4/3 instead

OpenStudy (ineedhelp10):

wait, @agreene do you divide by the pi or not?

OpenStudy (agreene):

yes, the pi gets cancelled in the division

OpenStudy (ineedhelp10):

ah okay, and you don't need to square root anything correct?

OpenStudy (agreene):

nope, as i showed up above, you just do the division of 2pi and resolve that to 2/3

OpenStudy (ineedhelp10):

ah okay thank you, i appreciate your time!:)

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