please show work
2007-04-07 07:15:45 · 6 answers · asked by Kyara R 1 in Science & Mathematics ➔ Mathematics
Circumference of a circle fomula
C =2 π r
C / 2π = 2 π r / 2 π
C / 2π = r . . .Use this formula
12 / 2 π = r
12 / 2(3.141592654) = r
12 / 6.283185307 = r
1.909859317 = r
To find the diameter multiply the the radius by 2
1.909859315 x 2 =
3.819718634
3.8 inches rounded to one decimal place
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2007-04-07 08:09:00 · answer #1 · answered by SAMUEL D 7 · 0⤊ 0⤋
Pi (π) is a number defined as C (circumference) divided by d (diameter).
π = C/d
If you want to find the diameter you need to rearrange the equation into:
dπ = C
d = C/π
Plug the numbers into a calculator and voila!
d = (12in)/(3.14159...)
d = 3.81972... inches
2007-04-07 07:38:13 · answer #2 · answered by RyanGoff 2 · 0⤊ 0⤋
The equation is diameter x pi= circumference. which is 2.5 x 3.14 = 7.85 since 5 is bigger or equal to 5 it rounds up to 1.9 Hope I helped!!!!!!!!!
2016-05-19 04:24:25 · answer #3 · answered by Anonymous · 0⤊ 0⤋
circumference=diameter times pi
c=d(pi)
c/pi=d
12/3.141592=d
I get about 3.8, rounded to the nearest tenth
2007-04-07 07:19:17 · answer #4 · answered by MLBfreek35 5 · 0⤊ 0⤋
12/pi = 3.8 inch
2007-04-07 07:18:27 · answer #5 · answered by hustolemyname 6 · 0⤊ 0⤋
3.8197
2007-04-07 07:23:29 · answer #6 · answered by ฉันรักเบ้า 7 · 0⤊ 0⤋