Final answer:
The circumference of a circle is found using the formula C = 2πr, where r is the radius.
Step-by-step explanation:
To find the circumference of a circle, you can use the formula C = 2πr, where r is the radius of the circle.
For the first question, with a radius of 9.4, the circumference would be C = 2π(9.4) = 2(3.14)(9.4) = 2(29.52) = 59.04 units.
For the second question, if the diameter is 4.75, the radius would be half of that, so the radius would be 2.375. Using the formula, the circumference would be C = 2π(2.375) = 2(3.14)(2.375) = 4.75(3.14) = 14.905 units.
For the third question, if the diameter is 18, the radius would be half of that, so the radius would be 9. Using the formula, the circumference would be C = 2π(9) = 2(3.14)(9) = 18(3.14) = 56.52 units.