Find the exact circumference.

d = 19.7 cm

Question

Find the exact circumference. 

d = 19.7 cm

anonymous · Answer

ok we know the circumference has an equation of d*pi
So multiply the diameter by pi and you will get your circumference

anonymous · Answer

Pi isnt an exact number so cant imagine how you can get an exact number for you circumference :P

anonymous · Answer

Well- I have to choose one of four choices
 
 A.
9.85 cm
 
 B.
19.7 cm
 
 C.
9.85π cm
 
 D.
19.7π cm

anonymous · Answer

sooo which one do you think??

anonymous · Answer

d stands for the diameter
and the equation of our circumference is Diameter * pi

anonymous · Answer

I followed the instructions but didnt get either

anonymous · Answer

what instructions -.-
Listen pi can be written like this π
So our circumference is d*π
What is d ??? You told me in your question that d = 19.7

anonymous · Answer

So using all this what do you think your answer will be ?

freckles · Answer

All black is asking you to do is replace d in the expression $$d \pi$$ to get your answer.

anonymous · Answer

so is it d

anonymous · Answer

Yes it is