well if you back figure it I got ABOUT 70 for the diameter. I wasn't sure if it needed rounding or not since the question did not specify. hopefully this is correct and helps!
Answer:
70
Explanation:
Area of a circle is
A = pi × r²
3850=pi × r²
Square root (3850÷pi) = r
35 = r
Diameter is twice the radius, so multiply by two.
D = 70
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