plz help me and explain how you got your answer thx

Answer:
The correct answer would be C = 533,800
Step-by-step explanation:
The formula for circumference is C = 2πr. To find the radius you must divide the diameter by 2.
Radius = 85000
now we have C = 2 * 85000 * 3.14
C = 533,800
Scientific Formula = 5.338 x 10^6