Given

Required :

The formula for the circumference of a circle:

When we substitute and simplify:
Using the ac method : (b-5) (b-3)
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The best estimate would be 100 centimeters. Since a foot is roughly 30 centimeters, 3 feet would be roughly 90 centimeters and 1/3 of a foot would be roughly 10 centimeters. Adding these together gives you the answer, 100 centimeters. Hope this helps!