Question

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

1/2pi
(1/pi)r
1/pi

Answer 1

@superdavesuper can you help?

Answer 2

is it 1/2pi

Answer 3

let the radius of the circle be r. then the circumference of the circle will be 2pi*r
radius:circumference
r:2pi*r
r/(2pi*r)
=1/(2pi)

Answer 4

yup u r right:)

Answer 5

Thank you this stuff is driving me crazy. :/

Answer 6

u r welcome:) R u stil havng doubts in that?

Answer 7

no i thought it was that but it seems geo is much harder than alg for me for some reason. when i think i have it right i find out im totally wrong and my logic is misplaced for some reason. So i find myself second guessing myself on everything now.

Answer 8

oh. Dnt wry u will get it right always with little more practice.:)

Answer 9

I'll just summarize this discussion:
The circumference of a circle is C=2(Pi)(r).

We want the ratio of (the radius of the circle) to (the circumference of the circle).
Algebraically, this ratio is simply r/C.

But C=2(Pi) r.

Then the ratio becomes

r
---- , which reduces to the same 1/(2Pi) as the others have gotten.
2(Pi)r

Answer 10

@mathmale thanks

Answer 11

My great pleasure!