2007-07-24 14:48:46 · 8 answers · asked by Howbout 1 in Science & Mathematics ➔ Mathematics
the formula for the circumference of a circle is
2(pi)r
r = the radius and (pi) = 3.14152..and so on.
divide the circumference by 2(pi) and u have the radius.
2007-07-24 14:52:01 · answer #1 · answered by onlyhope 3 · 0⤊ 0⤋
Circumference=pi * radius * 2
So, divide the circumference by pi (about 3.14159265358979323846264338327950288419712939937510) (yes i memorized 50 digits but the comp cut it off, im a weird person), and then by 2.
Note: In reality, 3.1416 is usually enough as an estimate for pi.
2007-07-24 15:15:34 · answer #2 · answered by Anonymous 3 · 0⤊ 0⤋
circumference is 2*radius*Pi so you
divide by 2Pi
2007-07-24 14:52:47 · answer #3 · answered by CHARINGA 2 · 0⤊ 0⤋
Radius is half the diameter, and diameter is circumference divided by 3.1415926 or thereabouts.
R = 1/2C/pi
2007-07-24 14:53:05 · answer #4 · answered by aviophage 7 · 0⤊ 1⤋
2*pi*r=C Divide both sides by 2 pi to get r alone on the left.
r = C/2*pi
2007-07-24 14:52:21 · answer #5 · answered by ecolink 7 · 0⤊ 0⤋
Formula for circumference is c=3.1416 x 2r where r= radius.
Therefore r=c/2(3.1416)
2007-07-24 16:46:49 · answer #6 · answered by Gbinz 3 · 0⤊ 0⤋
c= 2(pi)r
so
r= 2x(pi), divided by C
2007-07-24 14:51:28 · answer #7 · answered by kimmy! 4 · 0⤊ 0⤋
2 Ï r = C
r = C / 2Ï
2007-07-25 00:11:03 · answer #8 · answered by Como 7 · 0⤊ 0⤋