Circle A has a diameter of 7 inches, a circumference of 21.98 inches, and an area of 38.465 square inches. The diameter of circle B is 6 inches, the circumference is 18.84 inches, and the area is 28.26 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)

Question

Circle A has a diameter of 7 inches, a circumference of 21.98 inches, and an area of 38.465 square inches. The diameter of circle B is 6 inches, the circumference is 18.84 inches, and the area is 28.26 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)

welshfella · Answer

C = pi * d
21.98 = pi * 7

welshfella · Answer

- solve for pi 

Do similar thing for circle B.

yatonoragami · Answer

So would I do 21.98 x 3.14 x 7?

yatonoragami · Answer

And what do you mean with C= pi * d?

welshfella · Answer

No you have to isolate pi  
do this by dividing both sides of the equation by 7

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yatonoragami · Answer

So I would do 21.98 divided by 7??

welshfella · Answer

C = pi * d means 
Circumference = pi times diameter

welshfella · Answer

yes

yatonoragami · Answer

That would be pi?