Answer:
Hello there! If the circular device has a diameter of 4.5 inches, the radius of the device would be 2.25 inches.
Explanation:
The diameter of the circle is a line segment that not only passes through the center of the circle, but also has endpoints that are on the circle and opposite sides to each other. The radius, on the other hand, is half the distance of the diameter, or the distance from any point on the circle to the center of the circle. I've attached a picture below to show you what that would look like, if you're a visual learner.
Since we know the diameter of the circular device is 4.5 inches, and we know that the radius of a circle is half the length of the diameter of that same circle, that means the radius of the circular device would be
or 2.25 inches long.
Have a great day! Feel free to let me know if you have any more questions :)