Choose the graph of the line that goes through point (-5,5)and has a slope of 1/5.

circle: c = πd and a = πr^2 where r = d/2

part a: using the formula for circumference, solve for the value of pi for each circle. (4 points)

circle a:

c = πd

π = c/d = 28.26/9 = 3.14

circle b:

c = πd

π = c/d = 15.70 /5 = 3.14

part b: use the formula for area and solve for the value of pi for each circle. (4 points)

circle a:

a = πr^2 where r = d/2 = 9/2 = 4.5

π = a/r^2 = 63.585 / (4.5)^2 = 63.585 / 20.25 = 3.14

circle b:

a = πr^2 where r = d/2 = 5/2 = 2.5

π = a/r^2 = 19.625 / (2.5)^2 = 19.625 / 6.25 = 3.14

part c: what observation can you make about the value of pi for circles a and b? (2 points)

it doesn't matter how big or small the circle is, the value of pi always remains the same.