What is the radius if the circumference is 17mm?

To find the radius from the circumference, you can use the formula ( C = 2\pi r ), where ( C ) is the circumference and ( r ) is the radius. Given that the circumference is 17 mm, you can rearrange the formula to find the radius: ( r = \frac{C}{2\pi} ). Plugging in the value, ( r = \frac{17}{2\pi} \approx 2.71 ) mm. Thus, the radius is approximately 2.71 mm.