Respuesta :

Answer:

1249.366303

Step-by-step explanation:

C = 2xπxr

7850 = 2πr

7850/2 = πr

3925/π = r

r = 1249.366303

check: C = 2xπxr

2x π x 1249.366303

= 7849.999998

= 7850

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