Question

The ratio of the circumference of a circle to twice the diameter of the circle is which of the following?
A. pi/4
B. pi/2
C. pi
D. 2pi
E. 4pi

I know that it's B... but idk how to do this. Help?

Answer 1

circumference=2.pi.r , diameter =2r , r=radius
2.pi.r/2d=2.pi.r/4r=pi/2
C.pi/2 is correct

Answer 2

Circumference = pi * diameter
So
Circumference/(2*diameter) = pi/2

Answer 3

The circumference is equal to pi times diameter. "pi*d"
If you double the diameter, you will get "2*d"

if you ratio it:
pi*d/2*d

you will get pi/2.

Answer 4

okay, got it!
thanks guys! :D

Answer 5

You're Welcome :)