Question

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

A) 1/2pi
B) (1/pi)r
C) 1/pi

Answer 1

r - the radius of the circle

C - the circumference of the circle


`C=2\pi r`

The ratio:

`(r)/(C)=(r)/(2\pi r)=(1)/(2\pi)\to\fbox{A.}`

Answer 2

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

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