Help me ineed a good grade becasue i need a good grade

Part A:

Circle A

Circumference = 2πr

25.12 = 2π(4)

25.12 = 8π

Divide both side by 8

3.14 = π

Circle B

Circumference = 2πr

9.42 = 2π(3/2)

9.42 = 3π

Divide both side by 3

3.14 = π

Part B:

Circle A

A = πr²

50.24 = π(4)²

50.24 = 16π

Divide both side by 16

3.14 = π

Circle B

A = πr²

7.065 = π(3/2)²

7.065 = 9π/4

Divide both side by 9/4

3.14 = π

Part C:

He/She used exactly 3.14 for the value of pi in circle A and B to get the circumference and the area.