Consider five circles with radii of 1, 2, 4, 8, and 16 inches. Complete the chart. (Answers will be in terms of Pi). One has been completed for you.

|Radius|Circumference|Area|
|1|2pi in.|pi in.^2|
|2|
|4|
|8|
|16|

Help I have no idea what I'm supposed to do

3 answers

Part 2: Compare the areas and circumferences in the last problem.

What happens to the circumference and area of a circle when you double the radius?
c = 2πr
a = πr^2

so, plug in various values for r:

r c a
1 2π π
2 4π 4π
...
16 32π 256π

when 2r is substituted for r, you have new values for c and a:
2π(2r) and π(2r)^2
compare those to the original values using just r.
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