Just multiply 34 by pi to get your answer. ( Pi is approximately 3.14159 , but has no exact value.-- sometimes 3 1/7 is close enough.)
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If 34 inches is the radius or diameter of the circle, (or circumference?), it needs to be stated in the question! What is meant by "round circle?"
The circumference of 9 inch diameter circle is about 28.27 inches.
The circumference of a circle with a 39 inch diameter is 122.52 inches.
circumference = pi * diameter so, diameter = 9/ pi = 2.86
The circumference of a 42-inch diameter circle is: ~131.95 inches.