The length of the metal rim around a glass lens is 190 millimeters.
Is this measurement the diameter, radius, or circumference?
I said it was Circumference, the equation is:
Diameter: 390 millimeters D=2r. r=190
Radius: 95 millimeters R= 0.5d. d= 190
I hope this makes sense Thank you for helping me!


  1. Answer:
    Step-by-step explanation:
    The area around the outside of a circle (metal rim) is known as the circumference. You can think of it as the perimeter of a circle. The radius is the length of the line from the centre of the circle to a point on the circumference, and the diameter is double that a line that touches two points on the circumference and goes through the centre.


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