Circle a has a diameter of 9 inches, a circumference of 28.26 inches, and an area of 63.585 square inches. the diameter of circle b is 5 inches, the circumference is 15.70 inches, and the area is 19.625 square inches.. part a: using the formula for circumference, solve for the value of pi for each circle. (4 points) part b: use the formula for area and solve for the value of pi for each circle. (4 points) part c: what observation can you make about the value of pi for circles a and b? (2 points)

Circle A: Consider formula for circumference

Given,
Diameter (2r) = 9 inches ⇒ r = 4.5 inches
Circumference (2r) = 28.26 inches
Therefore,  = 28.26 ÷ 2r = 28.26 ÷ 9 = 3.14

Circle B: Consider formula for circumference

Given,
Diameter (2r) = 5 inches ⇒ r = 2.5 inches
Circumference (2r) = 15.70 inches
Therefore  = 15.70 ÷ 2r = 15.70 ÷ 5 = 3.14

Circle A: Consider formula for area

Given,  
Diameter (2r) = 9 inches ⇒ r = 4.5 inches
Area (r²) = 63.585 inches²
= 63.585 ÷ 4.5² = 63.585 ÷ 20.25 = 3.14

From the above, for circle A,  = 3.14

Circle B: Consider formula for area

Given,
Diameter (2r) = 5 inches ⇒ r = 2.5 inches
Area (r²) = 19.625 inches²
= 19.625 ÷ 2.5² = 19.625 ÷ 6.25 = 3.14

For circle B, value of  = 3.14

From the above observation, the value of  is a constant which is 3.14 and it is the same for both circles A and B

The first option would be correct if it were one half and not one