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OpenStudy (anonymous):
what is the surface area of a circle that has a diameter of 4 inches?
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jhonyy9 (jhonyy9):
do you know formula for area of a circle ?
OpenStudy (anonymous):
nope i do not
OpenStudy (anonymous):
\[surface~ area~ of~ sphere=4\pi r^2\] \[Area~ of~ circle=\pi r^2\]
OpenStudy (anonymous):
\[radius~ r=\frac{ diameter }{2 }\]
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