the answer is either 2, 4, 8 or 16!
2007-07-06 10:48:48 · 7 answers · asked by Demetria 1 in Science & Mathematics ➔ Mathematics
Circumference = 2(pi)r
Now plug in the values, use pi = 3.14
25.12 = 2*3.14*r
25.12 = 6.28*r
r = 25.12/6.28
r = 4
radius = 4cm
there u go.
2007-07-06 10:52:03 · answer #1 · answered by Anonymous · 1⤊ 0⤋
Circumference = 2*PI*R
so radius R = Circumferenc/(2PI)
= 25.12 /(2*3.14) =4
2007-07-06 11:42:09 · answer #2 · answered by buoisang 4 · 0⤊ 0⤋
C=2*pi*r
Since you know C and you know pi, put them into the equation and solve for r.
Since you have possible answers, you can also put those answers into the equation for r and see which results in a circumference closest to yours.
2007-07-06 10:52:58 · answer #3 · answered by GirlEngineer 1 · 0⤊ 0⤋
Divide by (2*pi)=about 6.28.
4 is closest.
Done.
2007-07-06 10:52:53 · answer #4 · answered by Jerry P 6 · 0⤊ 0⤋
It's 4cm radius.
2007-07-06 10:59:10 · answer #5 · answered by Norrie 7 · 0⤊ 0⤋
C = 2pi r
r = C/(2pi)
you have cirumfercence, just plug it in
2007-07-06 10:52:53 · answer #6 · answered by 7 · 0⤊ 0⤋
r = C /2pi
r = 25.12cm/6.28 = 4
2007-07-06 10:54:20 · answer #7 · answered by ironduke8159 7 · 0⤊ 0⤋