2007-03-08 23:38:43 · 4 answers · asked by fishman50us 1 in Science & Mathematics ➔ Mathematics
Circumference of a circle formula
C = 2 π r
C / 2 π = r . . ..use this formula
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30 / 2(3.141592654) = r
30 / 6283185307 = r
4.774648293 = r
4.77 inches rounded to two decimal places
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The diameter is 9.54 inches
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2007-03-09 00:19:02 · answer #1 · answered by SAMUEL D 7 · 0⤊ 0⤋
circumference = Ï*diameter so
diameter = circumference/Ï = 30/Ï = 9.549"
HTH âº
Doug
2007-03-09 07:43:55 · answer #2 · answered by doug_donaghue 7 · 0⤊ 0⤋
C = Ï .d
d = C / Ï = 30 / Ï inches
d = 9.55 inches ( to 2 dec. places)
2007-03-09 08:56:54 · answer #3 · answered by Como 7 · 0⤊ 0⤋
Cf=D*pi so D = cf/pi=9.55"
2007-03-09 07:58:18 · answer #4 · answered by santmann2002 7 · 0⤊ 0⤋