Which circles have a circumference of 18 PI units?

Choose all answers that are correct.

A. a circle with a radius of 9 units

Question

Which circles have a circumference of 18 PI units?
 
Choose all answers that are correct.

A. a circle with a radius of 9 units <--------
B. a circle with a radius of 18 units
C. a circle with a diameter of 18 units <------
D. a circle with a diameter of 36 units

I think it is a and c, plz help! I will give medal!

anonymous · Answer

@Bookworm14 @Unanimoose @Mehek14 @kennybm @Kkurayuma @outdoorgirl12 @pooja195 @perl @PookieBear555 @g@Quan99 @whydoihavetosignup1 @Bee_see

unanimoose · Answer

You are correct. :)

anonymous · Answer

This is the one that I am most confused with

anonymous · Answer

how exactly, I just want to be sure

unanimoose · Answer

Ok well you have to multiply the radius by 2, or double it.

SO A is an obvious one.

And since the diameter is simply double the radius, it is the same thing.

anonymous · Answer

OKAY, that makes sense

anonymous · Answer

thx!

anonymous · Answer

does anyone else agree?

anonymous · Answer

@Bookworm14  do u agree? I know u r busy...

anonymous · Answer

k, bye