SOLUTION: If the diameter of circle is 8 what is the ratio between the circles circumference and its area?

Algebra ->  Polygons -> SOLUTION: If the diameter of circle is 8 what is the ratio between the circles circumference and its area?      Log On


   

Question 1028947: If the diameter of circle is 8 what is the ratio between the circles circumference and its area?
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
Circumference
C+=+2%2Api%2Ar

Area
A+=+pi%2Ar%5E2

Ratio of circumference to area
C%2FA+=+%282%2Api%2Ar%29%2F%28pi%2Ar%5E2%29+=+%282%29%2F%28r%29

Now plug in the radius of 4 (diameter = 8, the radius is half of this)

%282%29%2F%28r%29=%282%29%2F%284%29=1%2F2

Final answer: 1%2F2 (in decimal form, this is equal to 0.5)