A. The circumference is (pi)d where d is the diameter. So (pi) for circle A is 21.98/7=3.14 and for B is 18.84/6=3.14.

B. Area is (pi)r^2 where r=radius or d/2. So for circle A (pi)=38.465/(3.5)^2=3.14 and circle B (pi)=28.26/(3)^2=3.14.

C. To two places of decimals (pi) has a value of 3.14 in all cases. This indicates or implies that (pi) is a universal constant applying to all circles using the formulae.

Part A)

circumference = PI * diameter

PI = circumference / diameter

PI = 21.98 / 7

PI = 3.14

PI = 18.84/6

PI = 3.14

Part B)

Area = PI * diameter^2 / 4

PI = 4 * Area / diam^2

PI = 4 * 38.465 / 7*7

PI = 153.86 / 49

PI = 3.14

Circle B

PI = 4 * Area / diam^2

PI = 4 * 28.26 / 6 * 6

PI = 113.04 / 36

PI = 3.14

Part C)

Conclusion - PI = 3.14 and is the same for both circles and is the same for EVERY circle.

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