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

a) 1/2pi
b) (1/pi)r
c) 1/pi

R - the radius of the circle

C - the circumference of the circle



The ratio:

Circumference of a circle =2pie r 
if we find ratio then circumfernce:radius
by putting value

=r:2pie r
=
r/2pir
=1/2pie