Question

What is the ratio of the radius of a circle to its circumference?

A. 1/2π

B. 1/πr

C. 1/π

D. 2/π

Answer 1

\[2\pi r=c\]

Answer 2

right?

Answer 3

r=radius
c=circumference

Answer 4

wait which one would that be though?

Answer 5

I'll derive in 10 seconds.

Answer 6

You know that pi is the ratio of the circumference to radius so radius to circumference is the inverse

Answer 7

Ratio of radius to circumference is\[\frac{ r }{ c }=\frac{ r }{ 2\pi r }=\frac{ 1 }{ ? }\]

Answer 8

\[\frac{ radius }{ circumference }=\frac{ 1 }{ \pi }\]

Answer 9

correction:\[\frac{ 1 }{ 2\pi }\]

Answer 10

2pi?

Answer 11

thank you guys

Answer 12

your awesome

Answer 13

FYI pi is the ratio of Diameter to circumference, not radius.

Answer 14

So 1/2pi is the correct answer.

Answer 15

@sugahead12 @science0229 is right. I eant diameter not radius so it is 1/(2pi)